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C

Concentration gradient

the change in the concentration of a substance from one area to another

Conceptus

embryo or fetus plus the surrounding membranes and placenta

Conditionally essential nutrient

a nutrient that is normally not essential but becomes so, due to certain physiological or pathological conditions resulting in relative deficiency

Conditioned reflex

a reflex action which has been modified in response to experience or learning. For example, a dog may salivate when it sees its owner remove a tin opener from a drawer.

Conjugation

bacterial mating

Connective tissue

tissue that binds structures together, made up of cells and an intercellular matrix and its functions include support, protection and repair

Constipation

infrequent or difficulty passing of faeces

Contagion

the transmission of disease from one individual to another

Contagious

capable of being transmitted between animals by direct or indirect contact

Contamination

the soiling or making inferior by contact or mixture

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