| A | B |
|---|
| biosphere | thin layer of air, land, and water that is home to all living things on Earth |
| organisms | all living things |
| spontaneous generation | process by which life begins when ethers enter nonliving things |
| biogenesis | principle that life comes only from life |
| cell | basic unit of organization in living things |
| examples of unicellular organisms | protists & bacteria |
| unicellular | made of one cell |
| multicellular | made of many cells |
| examples of multicellular organisms | plants & animals |
| reproduction | process through which new living things are formed |
| tissues | made of cells working together to form a specific function |
| organs | made of several different types of tissues that function together for a specific purpose |
| extinct | species that no longer exist |
| predator | organism that kills and eats another organism |
| prey | organism that is eaten |
| symbiosis | interdependence among organisms |
| mutualism | both partners in a symbiotic relationship benefit from their association |
| commensalism | symbiotic relationship in which one partner benefits and the other partner is unaffected |
| parasitism | symbiotic relationship between an organism and its partner is one-sided |
| scientific method | involves making predictions, designing an experiment(or series of observations) to test, making careful observations, interpreting results |
| hypothesis | possible explanation for an event or set of observations |
| variable | a factor that can change in an experiment |
| control setup | all factors remain the same during the experiment |
| theory | a hypothesis that is supported by many experiments done over a period of time |
