Which of the following statements is not true about ecosystems?
a healthy ecosystem can support an unlimited number of life forms.
the parts of an ecosystem depend on each other.
predators play a role in balancing the earth's ecosystems.
people's activities can improve the health of an ecosystem.

Which of the following statements best describes what is occurring in the land surrounding the sahara desert? a desertification is increasing, and the desert is expanding. b. fewer people are trying to farm in this semiarid region. c. the desert is shrinking with the increased use of irrigation. d. increased urbanization has resulted in decreased deforestation. select the best answer from the choices provided mark this and return save and exit next submit