Question

fill in the blanks. 1) The first legged vertebrates are collectively called as _____________ 2) The only reptile which possess a four chambered heart is ________________ 3) In bird's forelimbs are modified into ______________. 4) Mammary glanels are modified ____________​

Answer 1

Answer:

devonian stems- tetrapod

crocodile

wings

organs

Answer 2

Explanation:

1.Tetrapods

2 crocodilians

3 wings

4.sweat glands

thanks