MULTIPLE CHOICE In the space provided, write the letter of the term or phrase that best completes
each statement or best answers each question.
__6. Organisms that live in estuaries must adapt to changes in
a. temperature and precipitation,
b. sunlight and nutrients.
C. oxygen and pollutants.
d. water level and salinity.
7. Why doesn't photosynthesis occur in deep ocean water?
a. The water temperature is too cold.
b. There is no sunlight.
c. There are not enough nutrients.
d. The salinity level of the water is too high.
8. In estuaries, fresh water and salt water mix, forming a(n)
a. algal bloom.
C. coastal boundary.
b. habitat for shellfish.
d. nutrient trap.
9. Most of the nutrients in an arctic ecosystem come from
a. melting ice.
c. sunlight
b. the ocean.
d. lakes.
10. The majority of marine organisms are found in
a. deep ocean waters.
b. shallow, coastal waters.
c. hydrothermal vents.
d. salt marshes.