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.

lipid

explanation:

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.