Chpt1 lesson 3.txt

Collection of living matter and closed by a barrier that separates the cell from its surroundings.

To cells from different parents unite to produce first cells of the new organism.

The new organism has a single parent.

Combination of chemical reactions through which an organism builds up or breaks down materials.

a signal to which an organism responds.

The process by which organisms keep internal conditions such as temperature and water content, constant to survive.

The ability of a group of organisms to change over time.

Some of the levels which life can be studied include molecules, cells, organisms, population of single kinds of organisms, communities of different organisms in an area and the biosphere.