Flippers of a seal are:

Assertion: Comparative biochemistry provides strong evidence in favour of the common ancestry of living beings.
Reason: The genetic code is universal.

Briefly explain the significance of biochemical similarities in the study of evolution.

$Archaeopteryx$ $lithographica$, a fossilized crow-sized toothed bird, was found in Jurassic rocks in . . . . . . .

Choose the homologous organs from the given options.
$(I)$ Vertebrate hearts.
$(II)$ Vertebrate brains.
$(III)$ Thorn and tendrils of Bougainvillea and Cucurbita respectively.
$(IV)$ Vertebrate limbs.
The correct combination is:

Which of the following subdivisions of biology deals with the study of fossils?