Which change is an effect of overcrowding in an environment? decreased competition between a species

rate of animal reproduction decreases

less energy for consumers due to fewer plants
cooler temperatures in a habitat

Reduced mortality rate, better medical facilities, depletion of precious resources are few of the causes which result in overpopulation. ... It can result from an increase in births (fertility rate), a decline in the mortality rate, an increase in immigration, or an unsustainable biome and depletion of resources.”

The answer is C

Explanation:

I took the test.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.