Which is a factor that could interrupt the progress of succession? colonization of surfaces by lichens different animals appearing at each stage another natural disturbance long-term fluctuations in climate

oak trees? ? what was listed

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