Which of the following is an example of how a changing environment is important for the sustainability of living systems?
a.
the erosion of top soil reduces the diversity of organisms in an ecosystem.
b.
global climate change may lead to the extinction of many species that are unable to adapt to the changes.
c.
the water cycle ensures that water used by one organism will be available for another organism in the future.
d.
all of these

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The answer is C.

In terms of ecology, sustainability is a term used to describe the long-term survival or continuation of an ecosystem. There are certain environmental resources that are required by living systems. Resources such as water, oxygen, carbon, and nitrogen have a finite quantity on Earth. Because these resources are continually being renewed in a cycle, they can be used over and over.

For example, the water cycle ensures that water used by one organism will be available for another organism in the future.

those characteristics are cellular organization, reproduction, metabolism, homeostasis, heredity, response to stimuli, growth and development, and adaptation through evolution. some things, such as a virus, demonstrate only a few of these characteristics and are, therefore, not alive