| A | B |
|---|
| predators | an organism that feeds on another living organism which is called the prey |
| parasites | an organism that lives on or in another organism and causes it harm |
| species | a group of related organisms that can breed and produce fertile offspring |
| chromosomes | a structure, composed of DNA, that contains the genetic material |
| adaptations | special characteristics that make an organism well suited for a particular environment |
| antibiotic | a chemical that kills organisms of selected species; frequently used to combat infectious disease |
| sterile | two meanings: 1) incapable of reproduction; 2) containing no viable bacteria or spores |
| analogous structure | features in different species that have different evolutionary orgins but serve similar functins; for example, the wings on a fly, a bird , and a bat |
