What best describes the concept of motivation

By 2 weeks after fertilization the morula has implanted into the uterine lining and transforms into a(n) . this time is when the , or the organ that will provide nourishment to the fetus by exchanging nutrients and waste products, begins to develop.

Different plant and animal species have a great variety of body structures that them survive and reproduce. which of the following is also true? a. the individual cells of plants and animals cannot perform specialized functions. b. the individual cells of plants and animals function in very similar ways. c. the individual cells of plants and animals do not share any similarities. d. the individual cells of plants and animals do not contain genetic information. reset submit

Why does the body need calcium and what are the symptoms of calcium deficiency?