Bio 3 Exam Key Terms

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Key Terms (Bio3_Exam3)
Amniote – A group of organisms including reptiles, mammals and birds whose offspring develop initially internally. Body Cavity – A fluid or air filled space located between the digestive tract and the outer body wall. Also known as a coelom. Body Plan – Particular set of morphological and developmental traits integrated into a functional whole. Bottom–up Regulation – The study of how applying a pressure to the base of a food chain affects the links above it. Carnivorous – An animal that mainly eats other animals.

Carrying Capacity – The natural maximum sustainable population size of an organism as defined by the environment around it. Cephalization – A grouping of sensory organs and nervous cells in the anterior (front / head) region of an organism. Choanocyte – The collar cells in sponges. These are very similar to choanoflagellate which are the protists that evolutionarily predated animals. Cohort – A group of individuals of the same age in a population. Commensalism – A symbiotic relationship between organisms in which one organism benefits and the other is not affected. Community – An assemblage of populations of different species that can potentially interact in a meaningful way. Competitive Exclusion – A concept that when two populations that compete for the same resources one population forces the other from the resource. Demography – The study of changes over time in the vital statistics of populations especially birth rate and death rate. Density Dependent Factor –

Deuterostome – Anus forms first and then the mouth in development. Also characterized by radial cleavage and the formation of the body cavity from out-pockets of the mesodermal tissue. Dispersion – The pattern of spacing among individuals within the boundaries of a population. Disturbance – A natural or human caused event that changes a biological community and usually removes organisms from them. Dominant Species – A species with sustainably higher abundance or...
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