SBF 1

______ factors are living components of an ecosystem, and

abiotic factors are ______ components of an ecosystem.

• biotic; abiotic

• abiotic; biotic

• organisms; rocks

• aerobic; anaerobic

An organism’s _____ is the role it plays in its environment.

• niche

• habitat

• adaptation

• job

Organisms of different species that share a habitat often have different niches in order to reduce _____ for resources.

• competition

• predation

• the need for

• mating

_____ is the symbiotic relationship in which both species benefit.

• mutualism

• parasitism

• predation

• commensalism

_____ is the symbiotic relationship in which one species

benefits and the other is harmed.

• predation

• parasitism

• mutualism

• commensalism

_____ produce their own food using photosynthesis,

while _____ consume other organisms.

• autotrophs; heterotrophs

• heterotrophs; autotrophs

• consumers; producers

• parasites; mutualists

Only _____ of available energy is passed from one trophic level to the next.

• 10%

• 50%

• 75%

• 25%

_____ recycle nutrients from dead organic matter back to the soil.

• scavengers

• autotrophs

• decomposers

• viruses

_____ populations experience cycles of growth and decline; they are each other’s limiting factors.

• parasites and mammals

• predator and prey

• autotrophs and heterotrophs

• viruses and bacteria

A _____ is anything that restricts the distribution,

existence, or reproduction of a population.

• limiting factor

• carrying capacity

• niche

• habitat