Ecological niche - (ecology) The status of an organism within its environment and community (affecting its survival as a species)
Ecosystem - A community of organisms together with their physical environment, viewed as a system of interacting and interdependent relationships and including such processes as the flow of energy through tropic levels and the cycling of chemical elements and compounds through living and nonliving components of the system.
Empiricism - The view that experience, especially of the senses, is the only source of knowledge.
Entomology - The scientific study of insects.
Enzyme - Any of numerous proteins or conjugated proteins produced by living organisms and functioning as biochemical catalysts.
Eocene Epoch - Lasting from about 56 to 34 million years ago, is a major division of the geologic timescale and the second epoch of the Paleogene Period in the Cenozoic Era.
Ethology - The scientific study of animal behavior, especially as it occurs in a natural environment.
Eugenics - The study of hereditary improvement of the human race by controlled selective breeding.
Extinction (Background Extinction) - The ongoing extinction of individual species due to environmental or ecological factors such as climate change, disease, loss of habitat, or competitive disadvantage in relation to other species. Background extinction occurs at a fairly steady rate over geological time and is the result of normal evolutionary processes, with only a limited number of species in an ecosystem being affected at any one time.
Extinction (Mass Extinction) - The extinction of a large number of species within a relatively short period of geological time, thought to be due to factors such as a catastrophic global event or widespread environmental change that occurs too rapidly for most species to adapt. At least five mass extinctions have been identified in the fossil record.
Ecosystem - A community of organisms together with their physical environment, viewed as a system of interacting and interdependent relationships and including such processes as the flow of energy through tropic levels and the cycling of chemical elements and compounds through living and nonliving components of the system.
Empiricism - The view that experience, especially of the senses, is the only source of knowledge.
Entomology - The scientific study of insects.
Enzyme - Any of numerous proteins or conjugated proteins produced by living organisms and functioning as biochemical catalysts.
Eocene Epoch - Lasting from about 56 to 34 million years ago, is a major division of the geologic timescale and the second epoch of the Paleogene Period in the Cenozoic Era.
Ethology - The scientific study of animal behavior, especially as it occurs in a natural environment.
Eugenics - The study of hereditary improvement of the human race by controlled selective breeding.
Extinction (Background Extinction) - The ongoing extinction of individual species due to environmental or ecological factors such as climate change, disease, loss of habitat, or competitive disadvantage in relation to other species. Background extinction occurs at a fairly steady rate over geological time and is the result of normal evolutionary processes, with only a limited number of species in an ecosystem being affected at any one time.
Extinction (Mass Extinction) - The extinction of a large number of species within a relatively short period of geological time, thought to be due to factors such as a catastrophic global event or widespread environmental change that occurs too rapidly for most species to adapt. At least five mass extinctions have been identified in the fossil record.