Relationships in an Ecosystem..??

Among the populations of any natural community, the basic food supply is always a critical factor because it is

1) produced by all organisms of the community
2) synthesized from oxygen
3) a means of transferring energy
4) present in a surplus amounts

An earthworm lives and reproduces in the soil. Through its feeding, excretion, and tunneling activities, the worms adds nutrients and allows air to enter the soil. Together, these statements describe the earthworm's

1) habitat
2) nutrition
3) niche
4) environment

In a food chain consisting of photosynthetic organisms, herbivores, carnivores, and organisms of decay, the principal function of the photosynthetic organisms is to

1) capture energy from the environment
2) provide material for decay
3) prevent erosion of the topsoil
4) release energy from organic compounds

Basic food supply:
3) a means of transferring energy

Earthworms:
3)niche

Photosynthesis
1) Capture energy from the environment

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