The primary cost of tanning is ______________________
a. the energy needed to produce melanin
b. the time needed to lay in the sun
c. the money needed to purchase sunblock
d. All of the above are equally costly
e. I don't know the answer
Answer: a. the energy needed to produce melanin
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How could a plant adapt to reduced sunlight in a dense forest?
a. The plant could cling to trees and grow upward. b. The plant could develop broader leaves. c. The plant could develop more roots. d. Both (a) and (b) are correct
Which of the following should you expect to find for a living plant cell in a living plant?
a. a cytoplasm that is much more negatively charged than the fluid outside the cell b. a cytoplasm that has essentially the same charge as the fluid outside the cell c. a cytoplasm that is slightly more positively charged than the fluid outside the cell d. a cytoplasm that is much more positively charged than the fluid outside the cell e. a cytoplasm that is slightly more negatively charged than the fluid outside the cell
Each tier of the biomass pyramid depicts the
____ of all the organisms in an ecosystem. a. size b. number of species c. dry weight d. total weight e. total utilization of materials
Which of the following is TRUE of the biological makeup and functioning of the penis in human males?
A. The human penis contains a bone which aids in erection. B. The foreskin of the human penis is not retractable. C. The flaccid state of a penis is known as tumescence. D. The erection of a penis results purely from blood flow