Which of the following is not true regarding $Archaeopteryx$?

In the developmental history of the mammalian heart,it is observed that it passes through a two-chambered fish-like heart,a three-chambered frog-like heart,and finally a four-chambered stage. To which hypothesis can this above-cited statement be approximated?

Homologous structures have

Which of the following is $NOT$ a vestigial organ in humans?

Among the following sets of examples for divergent evolution,select the incorrect option:

The similarity of bone structure in the forelimbs of many vertebrates is an example of