Question

describing interactions between organisms
some interactions lead to, which occurs when organisms in an environment rely on each other for resources.
an example of this concept is, which occurs when two species require the same limited resource, such as food, water, shelter, or sunlight.
another example is, which occurs when one species benefits from the interaction and the other species is neither harmed nor helped.

Explanation:

The first blank refers to a general concept of organisms relying on each other for resources which is symbiosis. Competition is when two species need the same limited - resource. Commensalism is when one species benefits and the other is unaffected.

Answer:

First blank: Symbiosis
Second blank: Competition
Third blank: Commensalism