Which of the following structures serves as the cells boundary from its a) mitochondrion b) cell membrane c)chloroplast d) channel proteins

answer; the correct answer is desert plants;

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