Why do injuries happen frequently for people who do not exercise? (a) their bodies are too relaxed. (b)their minds are not prepared. (c) their bodies are not prepared. (d) their minds are too relaxed.

Which characteristic do healthy families have in common? a. having above average household income b. ignoring one another’s happiness c. demonstrating love for oneself d. communicating with one another

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

Which of the following could use reverse transcriptase to transcribe its genome? a) ssrnab) dsrnac) ssdnad) dsdna