Can you define population, community, ecosystem, and biosphere? How are they each related to each other?

Question

Hannah Amos · Accepted Answer

These are all organizational units used in ecology.

I would typically mark this as a duplicate, but because the answer to your question has been explained well through multiple answers across the site, I am going to point you to the following answers for more information:

Population
Community
Ecosystem
Biosphere

What is the difference between a population, a community, and an ecosystem?
How does an ecosystem differ from a biosphere?

Josephine Allen · Answer

undefined Population refers to a group of individuals of the same species living in a specific area and interacting with one another.

Community refers to all the populations of different species that inhabit a particular area and interact with one another.

Ecosystem encompasses all the living organisms (biotic factors) in a given area, along with their physical environment (abiotic factors) and the interactions between them.

Biosphere refers to the sum of all ecosystems on Earth and includes all living organisms and their environments.

These concepts are related in hierarchical order: individual organisms make up populations, populations form communities, communities interact within ecosystems, and ecosystems collectively comprise the biosphere. Each level depends on and influences the others, as organisms interact with one another and their environment to shape the structure and function of ecosystems at various scales.