B and G
E and G
B and C
C and D
Species A is the common ancestor of all life on Earth.
Species D is more closely related to species E than to species F.
Species B is the ancestor of species F.
Species C is the ancestor of species that exist at the present time.
Changes occurred to help the animals return to their original environment.
Changes contributed to the survival of the organism in their new environment
Changes helped reduce competition within each group.
Changes indicate the species are evolving to be more like the ancestral species.
Identical food preferences
Identical body sizes
Digest large, complex molecules
Contain more DNA than heart cells
Use different genes than the heart cells use
Remove carbon dioxide from blood
Segment 1, only
Segment 3, only
Segments 2 and 3
Segments 2 and 4
The organisms may have evolved from a common ancestor
All species have one kind of bone structure
The cells of the bones contain the same type of mutations
All structural characteristics are the same in animals