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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!!!!!!

tell whether each thing involves abiotic or biotic factors
commensalism
competition
habitat
mutualism
niche
predation

(1) ____ is an overbundance of nutrients that leads to excessive plant growth and reduction of oxygen in an ecosystem?
-denitrification
-eutrophication
-nitrification
-phosphorylation
(2)which of these biomes recives the greatest amount of yearly rainfall?
-boreal forest
-grasslands
-temperate forests
-tropical forests
(3) An organism’s position within a food web is know as its?
-ecosystem
-habitat
-niche
-tropic level
(4) Hydrothermal vent communities lack photosynthetic organisms at the base of the food web?
-true
-false
(5) the rigid, outer layer of earth is referred to as the asthenosphere?
-true
-false
(6) in commensalism, one species benefits and the other neither benefits nor is harmed?
-true
-false

Examples:
Biosphere – Pandora
Species – Navi
I need the following:
Population
Community
Ecosystem
Producer (autotroph)
Consumer (heterotroph)
Decomposer
Food Chain
Biotic
Abiotic
Niche
Competition
Predation
Mutualism
Commensalism
Parasitism
Secondary Succesion
Population Density
Limiting Factor

Examples:
Biosphere – Pandora
Species – Navi
I need the following:
Population
Community
Ecosystem
Producer (autotroph)
Consumer (heterotroph)
Decomposer
Food Chain
Biotic
Abiotic
Niche
Competition
Predation
Mutualism
Commensalism
Parasitism
Secondary Succesion
Population Density
Limiting Factor

The dissapearance of a population in a given niche as a result of direct competiton with another species for a resource is called….
A. Competitive exclusion
B. Predation
C. Parasitism
D. Commensalism
-thanks for the help!!