The thorn of $Bougainvillea$ and the tendril of $Cucurbita$ are examples of . . . . . . .

Explain: $(a)$ Homology $(b)$ Analogy.

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

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Forelimbs of humans and bats are homologous.
Reason $R$: Forelimbs of humans and bats have similar anatomical structure.
In the light of the above statements, choose the most appropriate answer from the options given below:

Who proposed the Recapitulation Theory?

The best types of fossils are obtained in the form of: