Answer with explanation:
Subpart 1
three types of skeletal support systems exists in animals.
a. Exoskeleton: external support to to protect internal soft bodied animal.
b. Endoskeleton: Internal skeletal supports like bones and cartilages.
c. hydrostatic skeleton: where main support system of the body is water content in the body.
Subpart 2
Exoskeleton is present in mainly arthropods such as insects, crustaceans, made of chitin.
In some molluscs also exoskeleton made of calcium carbonate is present such as snails and clams.
In some sponges ( porifera) exoskeleton is present which is also made of calcium carbonate.
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