The evidence for the origin of birds from reptiles is the presence in them of

The organs which have common origin but perform different functions are called as:

Identify the correct pair.

Reptilian character of $Archaeopteryx$ is . . . . . . .

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?

The age of fossils was traditionally determined by radio-carbon dating and other methods involving radioactive elements found in the rocks. More precise methods currently used for determining the evolutionary time of different groups of organisms include: