Ecology LC

a close relationship between different species that involves an exchange

• symbiosis

• parasitism

a symbiotic relationship in which both species benefit

• symbiosis

• mutualism

 a symbiotic relationship in which one species benefits, but the other is harmed

• parasitism

• mutualism

a symbiotic relationship in which one species benefits but the other is not affected

• parasitism

• commensalism

 the largest number of individuals of one species that an environment can support and maintain

• carrying capacity

• population

the part of Earth that supports life

• biosphere

• ecosystem

What have humans been able to do that other species cannot?

• increase the carrying capacity of their environment

• return from extinction

As a population grows, this means _____________________.

• no change in available resources for other species

• fewer resources available for other species

Which of these is a cause of human population decrease?

• medical care

• damage from natural disasters

When do populations increase?

• When birthrates are higher than deathrates.

• When birthrates are smaller than deathrates