Photosynthesis Photosynthesis plays a crucial role in the carbon cycle. Carbon constantly circulates in the earth's ecosystem. In the atmosphere, it exists as colorless, odorless carbon dioxide gas, which is used by plants in the process of photosynthesis. Animals get the carbon stored in plant tissue when they eat and exhale carbon dioxide. ... They are among the leading decomposers of organic matter; breaking down plant and animal remains and wastes into their chemical states, as well as having a critical role in the recycling of minerals and carbon. ...

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From studying volcanoes, it is known that eruptions pour out carbon dioxide, nitrogen, and other gases. It is also known that meteorites carry water, in the form of ice, and many carbon containing compounds. ... Geologists believe that the earth's early atmosphere contained water vapor, carbon monoxide, carbon dioxide, hydrogen, and nitrogen. ...

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• Grade Level: High School

Important Facts the smallest unit of life is the cell instructions for development are contained in DNA collectively, all of the chemical processes in a cell are called metabolism producers often obtain energy from the sun homeostasis refers to the ability to maintain a constant internal environment cells in domains archaea and eubacteria lack nucleii plants are multicellular producers an educated guess might be called a hypothesis science is based on evidence philosophy is not a step in the scientific method an atom is the smallest unit of substance that retains the properties of the subst...

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• Grade Level: High School