The part of the egg that nourishes the embryo is the
A lamprey is a kind of
Vertebrates are a subgroup of the phylum of
The structure that helps fish stabilize at different depths is the
Fossils are found most frequently in a kind of rock called
Which of the following is NOT an ectotherm?
One animal that cares for its newly hatched young is a(n)
An animal whose body temperature changes depending on the temperature of the environment is called a(n)
Fossils found in higher layers of rock are usually
younger than fossils found in lower layers
The name amphibian refers to an amphibian's ability to
live on both water and land
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