Question

Members of the phylum Echinodermata:

Question 1 options:

	a) have a unique water vascular system for movement and feeding.
	b) have a dermal endoskeleton.
	c) have secondarily derived bilateral symmetry.
	d) are known for their smooth, spineless skin.

Question 2

Mammals:

	a) all have hair.
	b) all have post-anal tails at some point during development.
	c) are exothermic.
	d) have mammary glands.

Question 3

Animals are all heterotrophic, meaning they can't produce their own food.

	True
	False

Answer 1

Question 1 Answer- a) have a unique water vascular system for movement and feeding

Explanation- Presence of water vascular system in echinoderms is considered as a distinguished features of echinoderms. Coelom which is modified and consists of watery fluid filled canals. They have important role in locomotion and feeding.

Question 2 Answer- d)have mammary gland

Explanation- presence of mammary gland in mammals is the unique feature they have. All mammals have mammary glands. Montremes like Platypus and Echidnas also have mammary glands but not possesses teats.

Question 3 Answer- True.

Explanation- As animals are depending on other for their food and cannot produce their own food, they are heterotrophic in nutrition.