facing away from the stem (the lower surface of a leaf).
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Type: Glossary
the process whereby the products of digestion are transported from the digestive tract into the...
Type: Glossary
the seepage of acidic, contaminated water from disused mines and mine dumps.
Type: Glossary
rain that contains high levels of sulfuric acid, hydrochloric acid and nitric acid.
Type: Glossary
animals that lack a cavity between the digestive tract and the outer body wall.
Type: Glossary
a disease caused by the human immunodeficiency virus (HIV).
Type: Glossary
the immunity an organism develops during its lifetime.