Questions and Answers
What is the one characteristic that all animals share?
They all feed on organic molecules.
Members of the Animal Kingdom can be divided into 2 large groups, what are the 2 groups?
Vertebrates and Invertebrates.
What are Invertebrates?
Animals without a backbone.
What are Vertebrates?
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How many groups of Invertebrates are there?
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What are the 4 groups of Invertebrates?
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List one feature that Arthropods have in common?
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There are 4 phylum of Arthropods. What are they?
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What are Nematodes and where are they found?
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What is the body structure of an Annelid?
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How is the structure of an Annelid adapted to its movement?
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Why do Molluscs have a hard shell?
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How does the body structure of a Myriapod help it to survive?
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What is an example of a Myriapod?
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What are the features that every insect has?
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Study Notes
Characteristics of Animals
- All animals share the characteristic of feeding on organic molecules.
Classification of Animal Kingdom
- The Animal Kingdom divides into two primary groups: vertebrates (with backbone) and invertebrates (without backbone).
Invertebrates vs. Vertebrates
- Invertebrates: Animals lacking a backbone.
- Vertebrates: Animals possessing a backbone.
Groups of Invertebrates
- There are four main groups of invertebrates:
- Nematodes
- Annelids
- Molluscs
- Arthropods
Features of Arthropods
- Common characteristic among arthropods: presence of jointed legs.
Phyla of Arthropods
- Four identified phyla include:
- Crustacea
- Myriapods
- Arachnids
- Insects
Nematodes
- Nematodes, such as hookworms, have bodies adapted for feeding and reproduction.
- They typically exist as parasites within the guts of host animals.
Annelids
- Annelids are characterized by a segmented body and chaetae (bristle-like structures).
- Their chaetae assist in movement, and a mucus layer prevents desiccation.
Molluscs
- Molluscs possess hard shells to protect their soft bodies and retain water.
Myriapods
- Myriapods feature antennae for sensory perception in their dim environments.
- Numerous body segments aid in movement under vegetation and rocks.
- Their mouthparts have hard edges, suitable for biting food.
- A hard exoskeleton offers protection from predators, while a waterproof body covering supports terrestrial life.
Example of a Myriapod
- Millipedes represent a common example of myriapods.
Insect Characteristics
- Every insect has three distinct body segments: head, thorax, and abdomen.
- All insects have three pairs of legs.
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Test your knowledge on the classification of invertebrate animals with these flashcards. Explore the characteristics that define all animals and delve into the division between vertebrates and invertebrates. Perfect for biology students seeking to strengthen their understanding of animal classification.
