| A | B |
|---|
| observe | to watch carefully, especially with attention to details or behavior for the purpose of arriving at a judgment. |
| ocean trench | a long, narrow, deep depression in the ocean bed. |
| omnivore | an animal that feeds on both animal and vegetable substances. |
| orbit | a path described by one body in its revolution about another (as by the earth about the sun or by an electron about and atomin nucleus. |
| organ | a differentiated structure (such as a heart, kidney, leaf or stem) consisting cells and tissues, and and performing some spacific functions in the organism. |
| organ syystems | organs working together for a spacific function. |
| organic | compounds containing carbon and chiefly or ultimately of biological orgins. |
| organism | an individual constituted to carryon the activities of life by means of organs separate in funcution but mutually dependent; a living being. |
| oxidation | combination of a substance with oxygen. |
| oxidize | to combine with oxygen. |
| parasite | an organism living in, with or on another organismi whichan organism benefits from a host that is usaly injured |
| pattern | a reliable sample of traits, acts, tendencies, or other observable characteristics |
| period table | an arrangement of chemical elements based on the periodic law |
| pH scale | a numerical measure of the acidity or alkalinity of a chemical solution |
| phenomenon | a fact or event of scientific interest susceptible to a description and exlpanation |
| photosynthesis | the chemical process by which chlorophy11- containing plants use light to convert carbon dioxide and water into carbohydrates, releasing oxygen as a byproduct |
| physical change | a change in a substance that does not alter its chemical makeup |
| physical properties | a property of a material that can be observed without changing the chemical makeup of the material |
| physiology | the biological science of the essintial and characteristic life processes, activities, and functions |
| planet | any of the large bodies that revolve around the sun in the solar system |
| pitch | the property of a sound, especially a muscial tone, thatis determined by the frequency of the waves producing it; highness or lowness of sound |
| pollution | a substance that, when added to the enviroment to be harmful or unfit for living things |
| population | all the plants or animals of the same kind found in a given area |
| potential energy | the energy, that matter has because of its position or because of the arrangement of atoms or parts |
| precipitation | a deposit on earth of hail, mist, sleet, rain, or snow |
| predator | an animal that lives by capturing prey as a means of mainting life |
| prey | an animal taken by a predator as food |
| producer | an of the various organisms ( such as green plant) which produce their own organic compounds from the simple precursors (such as carbon dioxide and inorganic nitrogen) and many of which are food sources for other organisms |
| prokaryotic | a cellular organism (such as a bacterium or a blue-green alage that does not have a disnict nucleus) |
| property | a quality or trait belonging to an individual or thing |
| proton | a stable subatomic particle occuring in all atomic nuclei with a positive electric charge equal in magnitude to that if an electron |
