Aquatic biomes can be distinguished by chemical characteristics such as dissolved oxygen content and salinity and by physical characteristics such as water flow.
which five of the following statements about aquatic biomes are true?

a. tropical coral reefs generally exist in relatively shallow areas of the ocean.
b. the lowest levels of dissolved oxygen in a stream are generally found in its turbulent headwaters.
c. wetlands have slow water movement or no water movement and no turnover.
d. estuaries are very productive and are used as breeding grounds by many species of fish.
e. all wetlands have soil that dry out periodically.
f. a freshwater organism permanently attached to the substrate would be unlikely to survive and reproduce in an estuary.
g. temperature drives water movement in some lakes.