Question

What do bats and sheep have in common that suggests that they share a common ancestor?
the presence of the same size of bones
the presence of the same shape of bones
the presence of the same number of bones
the presence of the same arrangement of bones

Answer 1

Bats and sheep share a common ancestor that suggests a similarity in their evolutionary history primarily through **the presence of the same arrangement of bones**. This is because both bats (which are mammals capable of flight) and sheep (which are terrestrial mammals) have limb structures that can be traced back to a common ancestral vertebrate. The arrangement of bones in their forelimbs—despite their different functions—demonstrates homology, indicating they evolved from a common ancestor.