E

Question 1

Ecosystem

Answer 1

All the living organisms (the community) in a place, and the interactions between them and their physical environment.

Question 2

Egestion

Answer 2

The passing out of food that has not been digested or absorbed, as faeces, through the anus.

Question 3

Embryo

Answer 3

The early stage of an animal or plant as it develops from a fertilised egg.

Question 4

Emphysema

Answer 4

A medical condition in which the walls of the alveoli are broken down. this reduces the surface area for gas exchange and means that the person cannot get enough oxygen into their blood.

Question 5

Emulsification

Answer 5

the breakdown of large fat globules into many tiny globules.

Question 6

Energy transfer

Answer 6

the transfer of energy from one trophic (feeding) level to the next.

Question 7

Enhanced greenhouse effect

Answer 7

Increase in concentration of greenhouse gases in the atmosphere leading to global warming.

Question 8

Enzymes

Answer 8

Biological catalysts that speed up the rate of chemical reactions in the body.

Question 9

Eutrophication

Answer 9

The enrichment of waters with plant nutrients that can stimulate growth of algae and plants.

Question 10

Evolution

Answer 10

The process in which inherited features change populations of organisms over time.

Question 11

Excretion

Answer 11

The removal from organisms of toxic materials, the waste products of metabolism and substances in excess of requirements.

Question 12

Extinct

Answer 12

when a species no long exists on the earth.