Which statement best describes a characteristic of the carrying capacity of an ecosystem?
1.
It can be illustrated with a food web.
2.
It allows organisms to produce populations of unlimited size.
3.
It is determined directly by an organism's reproductive success.
4.
It is limited by the habitat's available energy and nutrients.

Which of the following is an oxidation-reduction reaction? (pictured below)

What is the relationship between absorbance of light and the rate of photosynthesis?

Which best explains how a heat pump can heat a room? cold air from the house is moved through pipes, where it absorbs thermal energy. warm air from outside is pushed into the house to replace the cold air. combustion warms the air when chemical energy is transferred to thermal energy. fuel is used to move a piston, which pushes warm air into the house.