Peristalsis in the alimentary canal is caused by the: a. contraction of muscle layers b. action of digestive enzymes c. stretching of the mucosa d. closing of the epiglottis

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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