Seymouria is a connecting link between . . . . . . .

According to Haeckel's Law of Biogenesis,which of the following is true?

Which one of the following organs has become vestigial in humans due to the consumption of cooked food over many years?

In the embryos of all vertebrates,including humans,a row of vestigial gill slits appears behind the head,but they function only in fish and not in other adult vertebrates. This observation was challenged by which scientist?

The term for similarity in organ structure seen in organisms with great diversity is known as:

$A$: Muscles of external ears are fully developed in humans.
$R$: These muscles help in moving the ear pinna in humans.