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26.5: E

Created by: CK-12
eating disorder
mental illness in which people feel compelled to eat in a way that causes physical, mental, and emotional health problems
echinoderms
invertebrates such as sea stars and sand dollars that are characterized by a spiny endoskeleton, radial symmetry as adults, and a water vascular system
ecological succession
changes through time in the numbers and types of species that make up the community of an ecosystem
ecology
branch of biology that is the study of how living things interact with each other and with their environment
ecosystem
all the living things in a given area together with the physical factors of the nonliving environment
ectoderm
outer embryonic cell layer in animals
ectothermy
regulation of body temperature from the outside through behavioral changes such as basking in the sun
egg
female gamete
ejaculation
muscle contractions that propel sperm from the epididymes and out through the urethra in males
electron transport chain
series of electron-transport molecules that pass high-energy electrons from molecule to molecule and capture their energy
element
pure substance that cannot be broken down into other types of substances
elimination
process in which waste passes out of the body
embryo
stage of growth and development that occurs from implantation through the eighth week after fertilization in humans
emigration
movement of individuals out of a population
emphysema
lung disease, usually caused by smoking, in which walls of alveoli break down, so less gas can be exchanged in the lungs
endocrine system
human body system of glands that release hormones into the blood
endocytosis
type of vesicle transport that moves substances into a cell
endoderm
inner embryonic cell layer in animals
endoplasmic reticulum (ER)
organelle in eukaryotic cells that helps make and transport proteins
endoskeleton
internal skeleton that provides support and protection
endosperm
stored food inside a plant seed
endospore
spores that form inside prokaryotic cells when they are under stress, enclosing the DNA and helping it survive conditions that may kill the cell
endosymbiotic theory
theory that eukaryotic organelles such as mitochondria evolved from ancient, free-living prokaryotes that invaded primitive eukaryotic cells
endothermic reaction
chemical reaction that absorbs energy
endothermy
regulation of body temperature from the inside through metabolic or other physical changes
energy
ability to do work
enzyme
protein that speeds up biochemical reactions
epidermis
outer layer of skin that consists mainly of epithelial cells and lacks nerve endings and blood vessels
epididymis (plural, epididymes)
one of two male reproductive organs where sperm mature and are stored until they leave the body
epiphyte
plant that is adapted to grow on other plants and obtain moisture from the air
epistasis
situation in which one gene affects the expression of another gene
epithelial tissue
tissue made up of cells that line inner and outer body surfaces, such as skin
esophagus
long, narrow digestive organ that passes food from the pharynx to the stomach
estrogen
female sex hormone secreted by the ovaries
estuary
a partly enclosed coastal body of water with one or more rivers or streams flowing into it, and with a free connection to the ocean
ethology
branch of biology that studies animal behavior
eukaryote
organism that has cells containing a nucleus and other organelles
eukaryotic cell
cell that contains a nucleus and other organelles
evaporation
process in which liquid water changes to water vapor
evergreen plant
type of plant that keeps its leaves and stays green year-round
evidence
any type of data that may be used to test a hypothesis
evolution
change in the characteristics of living things over time; the change in species over time
exchange pool
part of a biogeochemical cycle that holds an element or water for a short period of time
excretion
process of removing wastes and excess water from the body
excretory system
organ system that removes wastes and excess water from the body and includes the kidneys, large intestine, liver, skin, and lungs
exocytosis
type of vesicle transport that moves substances out of a cell
exoskeleton
non-bony skeleton that forms on the outside of the body of some invertebrates and provides protection and support
exothermic reaction
chemical reaction that releases energy
exotic species
species that is introduced (usually by human actions) into a new habitat where it may lack local predators and out-compete native species
experiment
special type of scientific investigation that is performed under controlled conditions
exponential growth
pattern of population growth in which a population starts out growing slowly but grows faster and faster as population size increases
extinction
situation in which a species completely dies out and no members of the species remain
extremophile
any type of Archaea that lives in an extreme environment, such as a very salty, hot, or acidic environment

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Feb 23, 2012

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Oct 28, 2014
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CK.SCI.ENG.SE.1.Biology.26.5

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