Continuous fibers
A material consisting of extremely fine glass fibers, used in making various products, such as
yarns, fabrics, insulators, and structural objects or parts. Also called spun glass.
Continuous variation
A gradation of small differences in a particular trait, such as height, within a population;
occurs in traits that are controlled by a number of genes.
Contraception
The prevention of pregnancy.
Contractile roots
Contractile roots are found in many plants species mainly at the base of an underground
organ (bulb,corm,succulent rosette, etc.).
Contractile vacuoles
A small fluid-filled cavity in the cytoplasm of certain unicellular organisms; it gradually
increases in size and then collapses; its function is thought to be respiratory and excretory.
Conus arteriosus
The cone-shaped projection from which the pulmonary artery arises on the right ventricle of
the heart in man and mammals.
Convection
The mass movement of warmed air or liquid to or from the surface of a body or object.
Convergent evolution
The independent development of similarity between species as a result of their having
similar ecological roles and selection pressures.
Cooperativity
An interaction of the constituent subunits of a protein causing a conformational change in
one subunit to be transmitted to all the others.
Copulation
The sexual union of two individuals, resulting in insemination or deposition of the male
gametes in proximity to the female gametes.
Cork
A secondary tissue that is a major constituent of bark in woody and some herbaceous
plants; made up of flattened cells, dead at maturity; restricts gas and water exchange and
protects the vascular tissues from injury.
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