The carbon, oxygen, water, and nitrogen cycles all work together to keep earth's ecosystems in balance. describe an investigation modeling a problem that would affect all the cycles?
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Key point:
Energy flows through an ecosystem and is dissipated as heat, but chemical elements are recycled.
The ways in which an element—or compound such as water—moves between its various living and nonliving forms and locations in the biosphere is called a biogeochemical cycle.
Biogeochemical cycles important to living organisms include the water, carbon, nitrogen, phosphorus, and sulfur cycles.
Introduction:
What is your body made of? Not to put too fine a point on it: atoms. Lots and lots of them. About 7,000,000,000,000,000,000,000,000,000 to be precise.^1
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start superscript, 1, end superscript Where did all of those atoms come from?
If we really walk it backwards, most of the elements that make up our bodies—and those of every other living thing!—were born in dying stars billions of years ago. That's pretty cool, but it doesn't capture the whole picture. What have the atoms of your body been doing more recently, during their time on Earth?
Energy flows, but matter is recycled.
Energy flows directionally through Earth’s ecosystems, typically entering in the form of sunlight and exiting in the form of heat. However, the chemical components that make up living organisms are different: they get recycled.
What does that mean? For one thing, the atoms in your body are not brand new. Instead, they've been cycling through the biosphere for a long, long time, and they've been part of many organisms and nonliving compounds along the way. You may or may not believe in reincarnation as a spiritual concept, but there's no question that atoms in your body have been part of a huge number of living and nonliving things over the course of time
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