A relationship where one species kills and eats another species.

In some areas on the United States, moose are so infested with ticks that they die. The moose/tick relationship is considered

The ultimate source of energy in an ecosystem where a crab that eats small marine organisms is eaten by a seagull is

The first level of all food webs is

In a food web what type of organism will have the MOST biomass?

Cattle grazing in a field is an example of

A relationship where two species are competing for a resource, possibly a limiting factor

What organisms get their energy directly from the sun?

Why is it necessary to have a lot of energy at the bottom of the food web/chain?

A relationship where both organisms benefit from living in close proximity with one another is called

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