Kayleigh+C.

active transport- the movement of materials through a cell membrane using cellular energy adaptation- a trait that helps an organisms survive and reproduce. alleles-the different forms of a gene. amino acid-a small molecules that is linked chemically to other amino acids to form proteins. autouroph-an organism that makes its own food. branching tree-a diagram that shows how scientists think diffrently groups of oraganisms are related. cancer-a disease in which some body cells grow and divide uncontrollably damaging the parts of the body around them. carrier-a person who has one recessive allele for a trait but does not have the trait. cast-a type of fossil that forms when a mold becomes filled in with minerals that the harden. cell-the basic unit of structure and function in living things. cell cycle-the regular sequence of growth and divition that cells undergro. cell membrane-a cell structure that controls witch substances can enter or leave the cell. cell theory-a widley accepted explaination of the relationship between cells and iving things. cell wall-a rigid layer of nonliving material that surrounds the cell of plantsand some other organisms. chemotherapy-the use of drugs to treat diseases such as cancer.