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schistosomiasis: an infestation with or a resulting infection caused by a parasite of the genus Schistosoma; common in the tropics and Far East, also known as bilharzia.

scientific inquiry: the process of designing and conducting scientific investigations.

Secchi (disk) transparency: a method used to get a quick, simple and accurate measure of water clarity using a black and white disc, a Secchi disk, that is lowered into the water until it just disappears from sight. This depth measurement is then recorded.

slash-and-burn agriculture: an agricultural system in which farmers periodically clear land for farming by cutting and burning patches of forest.

socially responsible: a description of a company, organization or individual that conscientiously takes positive actions in terms of the welfare of employees and society at large.

speciation: the process by which one or more populations of a species become genetically different enough to form a new species. This process often requires populations to be isolated for a long period of time.

species: a group of organisms that have a unique set of characteristics (like body shape and behavior) that distinguishes them from other organisms. Individuals within the same species can typically reproduce with each other to produce fertile offspring. Species is the basic unit of biological classification.

sustainability: meeting the needs of the present without compromising the ability of future generations to meet their own needs or the health of the planet.

symbiotic: refers to an ecological relationship between two organisms. The relationship may be beneficial or detrimental to one or both organisms.

systematics: a branch of taxonomy involving the study and classification of the relationship between life forms and evolution.

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