The diagram shows the bone structure of the front legs of two animals: a frog (amphibian) and an alligator (reptile). shading is used to identify similar bones.

how does a comparison of the bone structures of the two animals provide evidence of an evolutionary relationship?

a.
the analogous structures are evidence that one animal evolved from the other.

b.
the homologous structures are evidence of descent with modification from a common ancestor.

c.
the homologous structures are evidence that one animal evolved from the other.

d.
the analogous structures are evidence that the two animals do not share a recent common ancestor.

The correct option is B) The homologous structures are evidence of descent with modification from a common ancestor.

Explanation:

Homologous structures can be defined as similarities between organs or skeletal of organisms which suggest that they might have a common ancestor in the past. Homologous structures will have alike structures although they may be present in animals of different texa.

For example, The front legs of a frog, which is an amphibian is similar to alligator which is a reptile. This common structure show that they have homologous structures and hence might have had a common ancestor in the past.  

a symbiotic relationship with the mitochondria

genetic variation will increase because of a new habitat and food source.

explanation: