Question

it is crucial to study ocean microbes because ______
a. they control the major biogeochemical cycles that keep earths biosphere in balance
b. they are a significant source of greenhouse gases and pollution
c. they are frequently used as food sources in developing nations
d. they provide a significant alternative energy source used to replace coal and oil

please select the best answer from the choices provided

○ a
○ b
○ c
○ d

Explanation:

Ocean microbes play a core role in regulating Earth's key biogeochemical cycles (like carbon, nitrogen, and oxygen cycles) that maintain the stability of the biosphere. Option B is incorrect as they are not a major source of greenhouse gases/pollution; many mitigate these. Option C is wrong because they are not a frequent food source in developing nations. Option D is incorrect as they are not a significant large-scale alternative to coal and oil currently.

Answer:

A. they control the major biogeochemical cycles that keep Earth's biosphere in balance