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Crossword clues

Solve these clues to fill the grid.

An enzyme that occurs in gastric juice
6 Across
An authoritative rule (plural)
10 Across
An essential amino acid found in proteins
12 Across
The maintenance of a certain quantities unchanged during chemical reactions or physical
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A chemical agent that destroys plants or inhibits their growth (plural)
14 Across
A chemical substance obtained from plants that is biologically active but not nutritive (plural)
15 Across
A system formed by the interaction of a community of organisms with their physical environment (plural)
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Strong desire for something
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A technique of growing plants in water containing dissolved nutrients
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Single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll
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The branch of molecular biology that studies the use of microorganisms to perform specific
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A chemical substance derivable from a mold or bacterium that can kill microorganisms and cure (plural)
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A flammable colorless gaseous alkene
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Undesirable state of the natural environment being contaminated with harmful substances as
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A person who uses goods or services (plural)
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A state of extreme hunger resulting from lack of essential nutrients over a prolonged period
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