I think you are talking about The scientific method
When the body is stressed, muscles tense up. Muscle tension is almost a reflex reaction to stress — the body's way of guarding against injury and pain. With sudden onset stress, the muscles tense up all at once, and then release their tension when the stress passes.
When forests are cut down, much of that stored carbon is released into the atmosphere again as CO2.
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cytoplasm, nucleus, cell membrane
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Healthy ecosystems purify our water, clean our air, maintain the soil, regulate the climate, recycle nutrients, and provide us with food. They provide raw materials and resources that can be made into medicines and other things. <u>Biodiversity</u> is the key indicator of the health of an ecosystem.
