Sea otter populations were reduced by overhunting, allowing an overgrowth of one of their prey
animals, the ____, which consumed populations of ____ and decimated them.
a. crabs; shrimp
b. abalone; algae
c. sea urchin; kelp
d. harbor seals; fish
e. crab; kelp
C
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What type of bond joins neighboring water molecules
Why are roots essential for terrestrial plants?
A) They absorb carbon dioxide needed for photosynthesis. B) They allow plants to obtain sun energy. C) They absorb water and minerals needed for growth. D) None of the above; plants can function without roots.
Which of the following is NOT associated with a higher cancer risk?
a. hormone therapy b. safe sex c. smoking d. use of alcohol e. exposure to certain hazardous chemicals in the workplace
What did Charles Darwin propose after observing the 11-inch-long nectaries of the Angraecum sesquipedale orchid in Madagascar?
A. that the orchid was an evolutionary dead end and could no longer reproduce B. the existence of a pollinator moth with a proboscis of 10–11 inches C. the presence of very small bees that can fit into a long nectar tube D. that the orchid must reproduce asexually E. that the orchid was a self-pollinator and required no assistance from an organism