| A | B |
|---|
| native species | All plants and animals originally found in an ecosystem. |
| natural selection | The organisms best adapted to their ecosystem will survive. |
| negative ion (anion) | An ion with more electrons than protons. |
| net force | The total of all forces acting on an object. |
| neutron | An electrically neutral particle found in an atom. |
| niche | A habitat filled by an organism specifically adapted for that habitat. |
| nuclear membrane | This structure controls what enters and leaves the nucleus. |
| nucleolus | This structure makes ribosomes. |
| nucleus | This structure is known as the brain of the cell. |
| observations | Information taken in about the world around us through our five senses. |
| orbit | The path an object takes around another in space. |
| osmosis | The movement of water across a cell membrane. |
| P generation | The first two individuals in a genetic cross. |
| parasitism | A relationship in which one organism benefits and the other is harmed or killed. |
| pascal | The unit used to measure pressure. |
| Pascal's principle | This principle states that the pressure remains unchanged in a confined fluid. |
| mutualism | When two members of a different species both benefit in a relationship. |
| phenotype | The physical description of an organism. |
| photosynthesis | The process by which plants convert light energy into chemical energy. |
| planets | Large bodies in space that orbit the sun. |
| plant cell | A rectangular cell that contains chloroplasts. |
| plasma | The 4th state of matter (a super heated gas) Ex. the sun |
| positive ion (cation) | An atom that contains more protons than electrons. |
| potential energy | The energy an object has due to its position. |
| mutation | A permanent change in a gene or chromosome |
