Eukaryote
An organism whose cells contain membraine-bound organelles and whose DNA is enclosed
in a cell nucleus and is associated with proteins.
Eumetazoa
Members of the subkingdom that includes all animals except sponges.
Eusocial
Applied to animal societies, such as those of certain insects, in which sterile individuals work
on behalf of reproductive individuals.
Eutherian mammals
Placental mammals; those whose young complete their embryonic development within the
uterus, joined to the mother by the placenta.
Eutrophic lake
A highly productive lake, having a high rate of biological productivity supported by a high
rate of nutrient cycling.
Eutrophication
A process in which an aquatic environment accumulates high nutrient levels due to factors
such as industrial or urban pollution or run-off of fertilizers from nearby agricultural lands.
The nutrients lead to dense blooms of algae and aquatic plants that cloud lake water,
deplete specific minerals and dissolved gases, and can cause natural plant and animal
populations to decline.
Evaporative cooling
The property of a liquid whereby the surface becomes cooler during evaporation, owing to a
loss of highly kinetic molecules to the gaseous state.
Evolution
All the changes that have transformed life on Earth from its earliest beginnings to the
diversity that characterizes it today.
Evolutionary species concept
The idea that evolutionary lineages and ecological roles can form the basis of species
identification.
Exaptation
A structure that evolves and functions in one environmental context but that can perform
additional functions when placed in some new environment.
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