Temperature, light, air, water, soil, and climate are all __________ parts of the environment.

A. biotic
Incorrect. Biotic means living. Temperature, light, air, etc. are nonliving factors.

B. abiotic
Correct!

C. living
Incorrect. Temperature, light, air, etc. are nonliving factors.

D. static
Incorrect. Static means stays the same. Temperature, light, air, etc. are constantly changing.

Which of the following best describes an ecosystem?

A. The region on, below, and above the Earth’s surface where life exists
Incorrect. This is the definition of biosphere.

B. All of the biotic and abiotic factors in an area
Correct!

C. A group of freely interacting and breeding individuals of the same species
Incorrect. This is the definition of populations.

D. All of the populations of different species living and interacting together in a distinct area
Incorrect. This is a definition of community.

Which of the following is a description of a biotic factor in an ecosystem?

A. The type of climate in a given region
Incorrect. Climate is an abiotic factor.

B. The amount of oxygen gas in the air
Incorrect. Oxygen is an abiotic factor.

C. Animals competing for the same food source
Correct!

Two or more individuals or populations trying to use the same limited resources such as food, water, shelter, space, or sunlight is called —

A. mutualism
Incorrect. Mutualism is a symbiotic relationship where both organisms benefit.

B. parasitism
Incorrect. Parasitism is a symbiotic relationship in which one organism survives by living off the nutrients of its host.

C. commensalism
Incorrect. Commensalism is a symbiotic relationship on which one organism is helped and the other organism is unaffected.

D. competition
Correct!

A resource in the environment that limits the size of a population is known as —

A. carrying capacity
Incorrect. Carrying capacity is the maximum number of organisms an environment can support.

B. limiting nutrient
Incorrect. Limiting nutrient is not the correct term for a resource that limits the size of a population.

C. limiting factor
Correct!

D. growth factor
Incorrect. Growth factor is not the correct term for a resource that limits the size of a population.