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Biology A Crossword

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Across
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DNA in the form of chromosomes
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A microscopic single celled organism that includes bacteria
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Collection of living matter enclosed by a barrier
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The network of nerve cells
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Energy currency of life
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Group of individuals of some species that live in the same area
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A set of organisms that allow a person to breathe and exchange oxygen
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A natural coloring matter of animal or plant tissues
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A bodily system that protects from foreign substances cells and tissues
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Group of ecosystems that have the same climate and dominate
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Negativity charged particle located outside the atomic nucleus
Down
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The center of the atom which contains the protons and neutrons
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Two units of heat energy
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Atom that has a positive or negative charge
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Basic principles of biology
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Basic unit of matter
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Group of similar organisms that can breed and produce fertile offspring
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The membrane surrounding the cytoplasm
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A series of hollow organs joined in a long twisting tube from mouth to anus
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A organism that is able to form nutritional organic substances
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The tendency toward a relatively stable equilibrium
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Scientific study of interactions among organisms between organisms and their enviro nment
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Substance consisting entirely of one type of atom
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Part of earth in which life exists including land,water and air
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Relating to involving or requiring free oxygen