Question

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Answer 1

$17) \: Classification$

1) Scorpion - Arthropods
2) Hydra - Coelenterates
3) Starfish - Echinodermata
4) Unio - Mollusc? (Unionidae)

$\infty \: \: \: characteristics \: of \: each$
1) Scorpions have a tough outer covering called exosleleto and the body consists of head, thorax and abdomen.
2) Hydra have a large number of arm-like structures called tentacles and its body is radially symmetrical.
3) Starfish have a radially symmetrical body and have tube-like feet.
4) Unio have a hinge filamemt in its body structure.

● BATS AND WHALES ARE KNOWN AS MAMMALS BECAUSE THEY CAN GIVE BIRTH TO YOUNG ONES AND THEY HAVE MAMMARY-GLANDS, FOUR-CHAMBERED HEART.

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