The three man limitations of models are the following. Models lose so they are simple enough to use. Models use- to describe what's happens in the world. Finally models can not always include all of the of the real system that they represent.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

the answer is c.mitochondria. glad to .