Explain how nicotine affects the blood vessels. How does this impact on the blood vessels cause smokers to be twice as likely as nonsmokers to die from a heart attack?

Which of these is the best example of sexual objectification? a) a female initiates a conversation with another female. b) a male proposes marriage to a female. c) a female makes repated coments to a male about his appearence. d) a female proposes marriage to a male.

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

If you are having a hard time lifting something, you should arch your back. a. true b. false