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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!!!!!!

Can you please help me with my sciene homework.. I don’t understand it and i can’t find it in the text book
1. A _____ is the role an organism plays in the ecosystem.
a habitat
b symbiosis
c population density
d niche
2 _____ is the largest number of individuals of a species that an environment can support and maintain for a long period of time.
a Population size
b Limiting factor
c Carrying capacity
d Symbiosis
3 The number of individuals in a population is the population’s _____.
a carrying capacity
b size
c density
d spacing

1. The number of individuals in a population is the population’s _____. (1 point)
carrying capacity
size
density
spacing
2. _____ is the largest number of individuals of a species that an environment can support and maintain for a long period of time. (1 point)
Population size
Limiting factor
Carrying capacity
Symbiosis
3. A _____ is the role an organism plays in the ecosystem. (1 point)
habitat
symbiosis
population density
niche

describe four factors that affect population size
identify factors that limit population growth
explain the difference between primary and secondary succession
differentiate between habitat and niche

a. melting of glaciers and permafrost
b. loss of high altitude species
c. increased productivity of food crops in the short term
d. increased drought and forest fires
e. all of the above are true
2) All of the following characteristics would make a species more prone to extinction except
a. low population density
b. specialized niche
c. short generation times
d. small population size
e. low reproductive rates

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)