Which of the following occurs during the third trimester? a. the embryo's head and brain begin to form. b.the fetus's hair and fingernails first begin to grow. c.the fetus's respiratory system prepares to breath air. d.the zygote attaches to the wall of the uterus.

During the first month of development, how many layers of cells make up the embryo? a. 1 b. 2 c. 3 d. 4

How do your emotions affect your personal physical fitness and dietary practices?

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