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what is the difference between these terms? (contrast)
Biosphere, Biome, Ecosystem, Community, Niche, Habitat and Popluation

(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

a.populations
b.organisms
c.biomes
d.niches
e.abiotic resources

i need to know this

All of the populations of different species that occupy and are adapted to a given area are referred to by which term?
a. biosphere
b. community
c. ecosystem
d. niche
B, ?

1. What were the biotic and abiotic factors in the ecosystem?
2. List the populations in the ecosystem. Which population was the largest? The smallest?
3. Describe one niche in the ecosystem.