- Echinoderm
- any member of the Phylum Echinodermata; invertebrates that usually have a hard, spiny skeleton, radial body and water vascular system; includes sea stars, sand dollars, sea urchins, and sea cucumbers
- Echolocation
- process that involves the emission of sounds that reflected back from objects; aids in the animal's orientation and object location; detection of object by reflected sound
- Ecology
- study of the relationships of organisms to each other and to their surroundings
- Ecosystem
- all of the life forms in a given environment with its associated abiotic (non-living) factors
- El Nino
- warm, tropical surface current flowing north and south along the west coasts of North and South America that usually happens every few decades
- Elasmobranch
- Any member of a class of fishes that includes sharks, rays, and skatesthat have a cartilaginous skeleton and plate
- Embryo
- young of an organism at its very early stages of development
- Endangered
- plant or animal whose prospects for survival and reproduction are in immediate jeopardy
- Endemic
- native to a specific area, habitat, or region
- Endoskeleton
- internal skeleton, like the bony or cartilaginous skeletons of vertebrates
- Envenomation
- to sting or impregnate an organism with a toxin by means of a stinger, spine, barb, bite or poisonous tissue
- Environment
- sum of biological and non-biological factors to which an organism, population or community is subjected
- Enzyme
- a protein molecule produced by living organisms that causes a cehmical reaction to take place at a faster rate or under different conditions without itself being destroyed or altered upon completion of the reaction
- Ephyra
- immature medusae
- Epibenthic
- living on the seabed
- Erosion
- loss of soil due to water flow, especially in areas where native vegetation has been removed
- Estivate
- state of dormancy induced by high temperature; breathing and circulation slows slightly
- Estrus
- period of sexual receptivity in most female mammals during which mating and conception occur
- Estuary
- area where fresh water in the form of streams or rivers influenced by oceanic tides empties into the ocean or a coastal bay, usually forming a salt marsh
- Ethology
- study of animal behavior
- Excluder
- a plant with the ability to exclude salt from tissues, example, salty Susan
- Excretor
- plant able to excrete salt from their tissues. example, sea lavender
- Exoskeleton
- external skeleton, like the "shell" of a crab or lobster. Usually made of keratin.
- Extinct
- no longer in existence
