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Questions and Answers
Why did the earliest amphibians develop primitive lungs?
Why did the earliest amphibians develop primitive lungs?
What adaptation allowed amphibians to spend longer periods on land?
What adaptation allowed amphibians to spend longer periods on land?
Why was there little pressure for amphibians to become better adapted to land?
Why was there little pressure for amphibians to become better adapted to land?
What feature enabled amphibians to resist desiccation on land?
What feature enabled amphibians to resist desiccation on land?
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What was the primary reason for the first vertebrates to adapt to a land environment from water?
What was the primary reason for the first vertebrates to adapt to a land environment from water?
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Which feature of lobe-finned fishes was beneficial for the first amphibians when they appeared?
Which feature of lobe-finned fishes was beneficial for the first amphibians when they appeared?
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What does the fossil example of a salamander-like amphibian suggest about its evolutionary characteristics?
What does the fossil example of a salamander-like amphibian suggest about its evolutionary characteristics?
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What does the recent fossil of Acanthostega suggest about the development of legs in amphibians?
What does the recent fossil of Acanthostega suggest about the development of legs in amphibians?
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In which stage of development do frog larvae primarily feed on small invertebrates?
In which stage of development do frog larvae primarily feed on small invertebrates?
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What is the primary mode of reproduction for amphibians?
What is the primary mode of reproduction for amphibians?
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Which group of amphibians is known for their legless, wormlike body and absence of limbs and limb girdles?
Which group of amphibians is known for their legless, wormlike body and absence of limbs and limb girdles?
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How do adult amphibians primarily eliminate solid and liquid waste material from their bodies?
How do adult amphibians primarily eliminate solid and liquid waste material from their bodies?
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Which respiratory organ do amphibians primarily rely on to exchange gases directly when in contact with water?
Which respiratory organ do amphibians primarily rely on to exchange gases directly when in contact with water?
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What is the primary function of the webbed feet commonly found in amphibians?
What is the primary function of the webbed feet commonly found in amphibians?
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Which circulatory system characteristic distinguishes adult amphibians from the larval stage?
Which circulatory system characteristic distinguishes adult amphibians from the larval stage?
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Which type of defense strategy involves an amphibian creating a burning sensation in the mouth of predators?
Which type of defense strategy involves an amphibian creating a burning sensation in the mouth of predators?
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In which habitat are caecilians primarily found?
In which habitat are caecilians primarily found?
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Which body form is typically associated with salamanders?
Which body form is typically associated with salamanders?
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What is the primary mode of respiration for adult amphibians?
What is the primary mode of respiration for adult amphibians?
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In which region of the world are most species of salamanders and newts found?
In which region of the world are most species of salamanders and newts found?
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Amphibians primarily eliminate ______ and liquid waste material from their bodies
Amphibians primarily eliminate ______ and liquid waste material from their bodies
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Liquid waste is secreted as ______
Liquid waste is secreted as ______
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Urine enters kidneys, being filtered into and pass into the urinary bladder for temporary ______
Urine enters kidneys, being filtered into and pass into the urinary bladder for temporary ______
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Both solid and liquid waste material is discharged through the ______
Both solid and liquid waste material is discharged through the ______
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The amphibian excretion process involves the discharge of ______ and liquid waste material
The amphibian excretion process involves the discharge of ______ and liquid waste material
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Digestive waste enters cloaca before it is ______ from the body
Digestive waste enters cloaca before it is ______ from the body
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Amphibians secrete liquid waste in the form of ______
Amphibians secrete liquid waste in the form of ______
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Cloaca is the opening through which amphibians discharge both solid and ______ waste material
Cloaca is the opening through which amphibians discharge both solid and ______ waste material
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Amphibians discharge both solid and liquid waste material through the ______
Amphibians discharge both solid and liquid waste material through the ______
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The amphibian excretory system manages the elimination of both solid and ______ waste material
The amphibian excretory system manages the elimination of both solid and ______ waste material
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Amphibians secrete both solid and ______ waste material as part of their excretion process
Amphibians secrete both solid and ______ waste material as part of their excretion process
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The excretion process in amphibians includes the elimination of both solid and ______ waste material
The excretion process in amphibians includes the elimination of both solid and ______ waste material
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Amphibians developed a heavier and stronger ______ for better support on land
Amphibians developed a heavier and stronger ______ for better support on land
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The strengthening of limbs in amphibians was essential for better ______
The strengthening of limbs in amphibians was essential for better ______
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The evolution of amphibians led to the skin being able to retain body fluids and resist ______
The evolution of amphibians led to the skin being able to retain body fluids and resist ______
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The competition was minimal for amphibians, allowing them to be on top of most food chains due to their stronger and heavier ______
The competition was minimal for amphibians, allowing them to be on top of most food chains due to their stronger and heavier ______
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Amphibians evolved from lobe-finned fishes and possessed strong and mobile ______ used as stabilizers during swimming.
Amphibians evolved from lobe-finned fishes and possessed strong and mobile ______ used as stabilizers during swimming.
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The fossil example of a salamander-like amphibian retained many characteristics of fish, such as a skull and tooth structures similar to fish, with a more elongated ______.
The fossil example of a salamander-like amphibian retained many characteristics of fish, such as a skull and tooth structures similar to fish, with a more elongated ______.
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The recent fossil of Acanthostega, one of the earliest known Devonian tetrapods, suggests that legs developed while the animal remained underwater, indicating the development of ______ while underwater.
The recent fossil of Acanthostega, one of the earliest known Devonian tetrapods, suggests that legs developed while the animal remained underwater, indicating the development of ______ while underwater.
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Acanthostega, the early tetrapod, had assemble fish tail with ______ rays.
Acanthostega, the early tetrapod, had assemble fish tail with ______ rays.
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The amphibian skull is dicondylic, and the skeleton is mostly ________
The amphibian skull is dicondylic, and the skeleton is mostly ________
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Amphibians show varying number of ________
Amphibians show varying number of ________
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Some amphibians may have ribs, while some are ________
Some amphibians may have ribs, while some are ________
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The body of amphibians is divisible into head and ________
The body of amphibians is divisible into head and ________
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The tail is present in Urodela, but ________ in Anuran
The tail is present in Urodela, but ________ in Anuran
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The amphibian skull is dicondylic, and the ________ does not persist
The amphibian skull is dicondylic, and the ________ does not persist
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The amphibian skull is dicondylic, and the skeleton is mostly bony. Some amphibians may have ________, while some are absent
The amphibian skull is dicondylic, and the skeleton is mostly bony. Some amphibians may have ________, while some are absent
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The amphibian skull is ________, and the skeleton is mostly bony
The amphibian skull is ________, and the skeleton is mostly bony
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The amphibian skull is dicondylic, and the ________ is present in Urodela, but absent in Anuran
The amphibian skull is dicondylic, and the ________ is present in Urodela, but absent in Anuran
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The amphibian skull is dicondylic, and the skeleton is mostly bony. The body is divisible into head and ________
The amphibian skull is dicondylic, and the skeleton is mostly bony. The body is divisible into head and ________
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The amphibian skull is dicondylic, and the skeleton is mostly bony. The body divisible into head and trunk. The tail is ________ in Urodela, but absent in Anuran
The amphibian skull is dicondylic, and the skeleton is mostly bony. The body divisible into head and trunk. The tail is ________ in Urodela, but absent in Anuran
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The amphibian skull is dicondylic, and the skeleton is mostly bony. Varying number of ________
The amphibian skull is dicondylic, and the skeleton is mostly bony. Varying number of ________
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Study Notes
Evolution of Amphibians
- Earliest amphibians developed primitive lungs to adapt to changing oxygen levels in water and to breathe air.
- The adaptation that allowed amphibians to spend longer periods on land was the development of skin that could resist water loss.
Characteristics of Amphibians
- Amphibians resist desiccation on land due to their permeable skin that helps to conserve water.
- The primary reason for the first vertebrates to adapt to a land environment from water was to escape lack of food and oxygen in water.
- Lobe-finned fishes' feature that was beneficial for the first amphibians was their limb-like fins.
Fossil Records
- The fossil example of a salamander-like amphibian suggests that it retained many characteristics of fish, such as a skull and tooth structures similar to fish, with a more elongated body.
- The recent fossil of Acanthostega suggests that legs developed while the animal remained underwater.
Developmental Stages
- Frog larvae primarily feed on small invertebrates during the aquatic stage of their development.
Reproduction and Respiration
- The primary mode of reproduction for amphibians is through external fertilization of eggs.
- Amphibians rely on their skin to exchange gases directly when in contact with water.
Body Structure and Functions
- Webbed feet in amphibians are primarily used for propulsion and maneuverability in water.
- Adult amphibians have a closed circulatory system, unlike their larval stage which has an open circulatory system.
- Caecilians are legless, wormlike amphibians that lack limbs and limb girdles.
Excretion and Waste Elimination
- Amphibians primarily eliminate solid and liquid waste material from their bodies through the cloaca.
- Liquid waste is secreted as urine, which enters the kidneys and is filtered into the urinary bladder for temporary storage.
- Both solid and liquid waste material is discharged through the cloaca.
Defense Mechanisms
- Some amphibians can create a burning sensation in the mouth of predators as a defense strategy.
Habitat and Distribution
- Caecilians are primarily found in underground habitats.
- Salamanders are typically characterized by their long, slender bodies.
- Most species of salamanders and newts are found in the region of North America and Europe.
Studying That Suits You
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Description
Test your knowledge of the general characteristics and diet of amphibians with this quiz. Explore their vertebrate nature, ectothermic behavior, and oviparous reproduction. Learn about the varying diets of frog and salamander larvae at different development stages.
