Page 15 - ingilizce

DDT : A toxic pesticide found to accumulate in the food chain and cause the death of animals

which were only indirectly exposed.

Decompose : To decay, to rot; to break down into smaller particles.

Decomposer : An organism that breaks down cells of dead plants and animals into simpler
substances.

Decomposition : The process of breaking down complex materials into simpler substances.

End products of much biological decomposition are carbon dioxide and water.

Digestive tract : The long tube where food is broken down into forms an animal can use. It

begins at the mouth and ends at the anus.

Dissect : To cut open in order to examine and identify internal structures.

Dissolve : To go into solution.

Dorsal : The top surface of an earthworm.

Earthworm : A segmented worm of the annelid group which contains some 3500 species. Most

earthworms are terrestrial that is, they live in the ground. Earthworms have bristles known as
setae which enable them to burrow in the soil. Earthworms help to aerate and enrich the soil.

Ecology : The science of the interrelationships between living things and their surroundings.

Egg : A female sex cell capable of developing into an organism when fertilized by a sperm.

Egg case : See cocoon.

Eisenia fetida : Scientific name for one of several redworm species used for vermicomposting.
Color varies from purple, red, dark red to brownish red, often with alternating bands of yellow

in between segments. Found in manure, compost heaps, and decaying vegetation where
moisture levels are high. Frequently raised in culture on earthworm farms.

Environment : Surrounds, habitat.

Excrete : To separate and to discharge waste.

Experiment : To conduct research by manipulating variables to answer specific questions

expressed as statements known as hypotheses.

Feces : Waste discharged from the intestine through the anus. Manure. Worm castings.

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