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Can someone please help me with these two science questions?
The relationship in which one species benefits and the other is unharmed is known as what?
-a niche
-commensalism
-mutualism
-parasitism
Population size is limited by all of the following except what?
-biotic factors
-abiotic factors
-competition
-none of the above
Thank you!!!!!!

1. What is the function of a producer in a food chain?
.to consume energy from various plants and animals in the food chain
.to break down essential nutrients and return them to the soil
.to create energy-rich molecules, such as glucose
.to create symbiosis in an ecosystem
2. The role a species plays within a community is its
.niche.
.habitat.
.population.
.ecology.
3. The relationship in which one species benefits and the other is unharmed is known as
.a niche.
.commensalism.
.mutualism.
.parasitism.
4. Population size is limited by all of the following except
.biotic factors.
.abiotic factors.
.competition.
.All of these can limit population size.
5. The _________________ is the part of Earth’s crust, water, and sky that supports living organisms. (1 point)
6. Using all the terms provided here, construct a food chain of your own. Make sure to show the flow of energy in your food chain. Terms to use include producer, herbivore, carnivore, omnivore, and decomposer. (1 point)