2) explain what a target cell/tissue/organ is with respect to the endocrine system.

The specific distant organ which is affected by a specific hormone secreted by a  endocrine gland is called the target organ. For example, oxytocin secreted by the posterior pituitary affects the contraction of the walls of uterus resulting in parturition. Here, the uterine wall is the target organ.

Explanation:

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