Only 20 types of amino acids are used in proteins of all species. Have nearly an infinite number of amino acids possible. If you inject human serum into a rabbit, the rabbit forms antibodies. If you take rabbit serum with the antibodies and inject it into other animals, the antibodies will react most strongly with those animals most like man. Tests indicate that man is most like apes.
Whales have traces of hind legs and hips.
The idea that each species was created individually by God cannot be tested. Creationists say that it is to test your faith.