Name two symbiotic relationships that bacteria have.

Early population ecologists conducted most of their research on small islands rather than on continents because a number of features of island populations make them easier to study. Which of the following is not one of those features? 1.

The differences in successive sedimentary rock layers provide clues about how ancient environments changed over time. True False

Which term refers to genetic changes which give their carriers a better chance to survive and reproduce than individuals without the genetic change who live in the same environment?

Which of the following is a place you might find a convex mirror? A. A convenience store B. Your bathroom c. A dressing room where you try on clothes D. A movie theater projection room

As you descend through the water column, a. temperature decreases. b. pressure decreases. c. light increases. d. density decreases.

If you were testing how well different laundry soaps cleaned your clothes, the control group would be:

The nurse is describing how to perform a testicular self-examination to a patient. Which of these statements is most appropriate? A. A good time to examine your testicles is just before you take a shower. B.

In which ways are RNA and DNA different? a. RNA has ribose sugar, DNA has deoxyribose sugar b. RNA has uracil, DNA has thymine c. RNA is single-stranded, DNA is a double-helix d. all of the above

Why do you have to spit out your gum before the extraction of DNA?

Humans have chromosome pairs.