1) Most ________ have swim bladders. a) marine mammals b) lobe-finned fishes c)

Question

1) Most ________ have swim bladders.

a) marine mammals
b) lobe-finned fishes
c) jawless fishes
d) ray-finned fishes
e) cartilaginous fishes

2)Why do amphibians need a moist environment?

a)The gills of the adult won't work if they dry out.
b)Amphibians eat only aquatic organisms.
c)Their eggs have only a jelly-like coating that needs to stay moist.
d)Amphibians require a moist environment for their scales to develop.
e)Amphibians require a moist environment to support their body weight because their cartilaginous skeleton is weak.

Explanation / Answer

1. a) marine mammals

2. e)Amphibians require a moist environment to support their body weight because their cartilaginous skeleton is weak.

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