Which of these would have the least access to phytoplankton? A) estuary B) salt marsh C) deep sea D) mangrove forest E) open ocean

The place that would have the least access to phytoplankton is the deep sea.

Explanation:

Phytoplankton is related to all aquatic microorganisms capable of performing photosynthesis, which is why they are considered autotrophs and producers within the trophic chain. They contribute to providing food to other species and to balancing the concentration of O₂ and CO₂ in water and the atmosphere.

Being organisms that depend on photosynthesis, they are usually very close to the surface of aquatic ecosystems - taking advantage of sunlight - so that in the deep sea it is not possible to find phytoplankton.

Learn more:

Phytoplankton