Question

all the biotic and abiotic factors in a marsh forma. a niche.b. a population.c. an ecosystem.d. a biosphere.

Explanation:

• A niche is the role or function of an organism in its environment.
• A population is a group of individuals of the same species living in a particular area.
• An ecosystem consists of all the biotic (living) and abiotic (non - living) factors in a given area interacting with each other.
• The biosphere is the global sum of all ecosystems.

Since the question refers to all biotic and abiotic factors in a marsh (a specific area), the concept of an ecosystem is applicable.

Answer:

C. an ecosystem.