Worldwide, decay of organic matter is important to the global carbon cycle because it ____ tens of billions of tons of
carbon dioxide each year.
a. removes from the atmosphere
b. prevents the planet from losing
c. returns to the atmosphere
d. prevents plants from having access to
e. releases to space
ANSWER: c
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Discuss the phenomena of immunological tolerance and autoimmune disease
What will be an ideal response?
Sometimes the most abundant color form of an animal is preyed upon more extensively than less
common forms. This illustrates the phenomenon of
a. stabilizing selection. b. directional selection. c. disruptive selection. d. frequency dependent selection. e. genetic drift.
What structures are found between the
vertebrae?
a. cartilage b. tendons c. fibrous connective tissue d. ligaments e. bone marrow
Cell theory or cell doctrine is based on some basic principles. Choose the description that best addresses these principles.
A. Cells are the smallest unit of living organisms, and new cells form from pre-existing cells by cell division. B. All life is composed of two or more cells, the smallest unit of life are cells, and cell division from pre-existing cells is the only way cell continue to exist. C. New cells come only from pre-existing cells by cell division. D. All living organisms are composed of one or more cells, cells are the smallest units of life, and new cells come only from pre-existing cells by cell division. E. All living things are composed of one or more cells.