Assertion: Animals that have an exoskeleton, lacks an endoskeleton. Reason: Skeleton cells in the embryonic stage migrate to either stage and produce exoskeleton or endoskeleton but never both.
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Both Assertion and reason are incorrect.
Explanation:
Some animals have both exoskeleton and endoskeleton. For eg. Tortoise and Turtle. All arthropods (such as insects, spiders and crustaceans) and many other invertebrate animals (such as shelled mollusks) have exoskeletons. An endoskeleton is an internal skeleton composed of hard, mineralized tissue that also enables movement by attachment to muscles.
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Both Assertion and Reason are false
Explanation:
- Animals and humans both rely on their skeletons for structural support. It aids in movement and motility, as well as safeguarding the internal organs. Exoskeleton (outward) and endoskeleton (inward) skeletons are both possible (inner). Others creatures have an exoskeleton, some have an endoskeleton, while others have both.
- An exoskeleton is a thick coating present on an animal's surface. The calcified shells within the exoskeleton function as a protective layer for the animal. The endoskeleton is made up of bones and cartilage and is held together by connective tissues.
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