The presence of gills in the tadpole of a frog indicates that:

Choose the correct statements with reference to organic evolution.
$I.$ Flippers of whale and wings of bat exhibit analogy.
$II.$ Wings of butterfly and wings of bird exhibit homology.
$III.$ Organs with dissimilar structure are called analogous organs.
$IV.$ Organs with similar structure and origin are called homologous organs.

Vestigial organs occur as:

Which vestigial structure develops in the embryos of all vertebrates,including humans?

What do the human hand,bat wings,and whale flippers represent?

The rocks that contain fossils are: