Question

Which of the following is/are example(s) of homologous structures?

		The eye of a fish and the eye of a cat.
		the fusiform shape of a dolphin and a shark
		the front leg of a horse and a human arm
		the wing structure of a bird and a bat wing structure

Answer 1

These two are analogous.

1)The eye of fish and eye of cat

2) fusiform shape of shark and dolphin

Because they have different ancastral origin, and they have same function.

And homologous structures are

1) front leg of horse and arm of human.

Both have similer anatomical structures(having common ancestry) and different function.

If we consider the bird and bat wings anatomy of forelimbs, both are homologous.

(But birds have father's etc.. So these are analogous to bat wings)