Answer:
D
Explanation:
Because every system in the body is vital
A niche is an organism's role in a community.
What it eats, Where it eats, When it eats, and its job in that environment.
Answer:
Scientists estimate that 50-80% of the oxygen production on Earth comes from the ocean. The majority of this production is from oceanic plankton — drifting plants, algae, and some bacteria that can photosynthesize. One particular species, Prochlorococcus, is the smallest photosynthetic organism on Earth.
Explanation: