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Questions and Answers
What are arthropod characteristics?
What are arthropod characteristics?
- Having jointed limbs (correct)
- Having an exoskeleton (correct)
- Having good senses (correct)
- Having a backbone
What is an exoskeleton?
What is an exoskeleton?
A rigid external covering for the body in some invertebrate animals, providing support and protection.
What are arachnids?
What are arachnids?
Members of a major arthropod group that includes spiders, scorpions, ticks, and mites.
What defines insects?
What defines insects?
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What is metamorphosis?
What is metamorphosis?
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What is the difference between centipedes and millipedes?
What is the difference between centipedes and millipedes?
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What are echinoderms?
What are echinoderms?
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Study Notes
Arthropod Characteristics
- Arthropods possess jointed limbs allowing flexibility and movement at joints, similar to human limbs.
- They are invertebrates, lacking a backbone, which suits their lifestyle and survival needs.
- An exoskeleton serves as a protective hard outer covering that provides support and shapes their body.
- Superior senses characterize arthropods, with advanced eyesight, motion-sensing antennae, tympanic membranes for hearing, and taste sensors located in their feet.
- Bilateral body symmetry is common, dividing their bodies into two equal halves, much like humans.
Exoskeleton
- A rigid covering found in certain invertebrates, particularly arthropods, that provides structural support and protects internal organs.
Arachnids
- This arthropod group includes spiders, scorpions, ticks, and mites, all characterized by having eight pairs of walking legs.
Insects
- Defined by three distinct body sections, six legs, one pair of antennae, and typically one or two pairs of wings.
Metamorphosis
- Refers to the significant physical transformations an organism undergoes from birth to adult form.
Centipede and Millipede
- Centipedes and millipedes share a common ancestry dating back over 400 million years, with elongated, segmented exoskeletal bodies.
- Centipedes have a flattened body and exhibit a single pair of legs per body segment, along with venomous legs for predation.
- Millipedes feature a rounded body, possessing two pairs of legs per body segment and lacking venomous limbs, with shorter antennae compared to centipedes.
Echinoderm
- Marine invertebrates characterized by rough or spiny skin, a water vascular system, an endoskeleton, and adult radial symmetry, including species like sea stars, sea urchins, and sand dollars.
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