3. In an ecosystem, different organisms interact with each other.
What evidence from the passage supports this statement?
A. Plants use sunlight, water, and carbon dioxide in a process called photosynthesis.
B. Forest ecosystems cover about a quarter, or one-fourth, of the total land surface in the
world.
C. Producers are living things that can make their own energy out of non-living
resources.
D. A deer decomposing in the soil provides food for bacteria and nutrients for plants to
grow.
4. Based on the information in the passage, what do all ecosystems have in common?
A. All ecosystems are home to living beings that interact with each other.
B. All ecosystems are home to trees, deer, humans, rodents, wolves, hawks, and
bacteria.
C. All ecosystems have an equal number of consumers, decomposers, and producers,
D. All ecosystems have a few consumers that do not interact with decomposers and
producers.

3. D. A deer decomposing in the soil provides food for bacteria and nutrients for plants to  grow.

4. A. All ecosystems are home to living beings that interact with each other.

Explanation:

In an ecosystem, different organisms interact with each other because one organism is the food of another organism or in other words organisms interact with each other in order to take nutrients from one another. There are some interaction in which both gets benefit and some interaction only one get benefit and the other get harmed. Examples of such type of interaction are Predation, parasitism and herbivory.

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an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.