D) Ecosystem's processes are self-regulated by interactions among their living and nonliving components.
A) Ecosystems are always open to gains and losses of matter and energy.
At virtually any level of use, nonrenewable resources can be
D) Ecosystem's processes are self-regulated by interactions among their living and nonliving components.
A) Ecosystems are always open to gains and losses of matter and energy.
At virtually any level of use, nonrenewable resources can be