NECESSITIES OF LIFE NOTES:
- Essential Question:
What do scientists consider to be the necessities of life? (needs for survival)
| 1. What does every living thing need in order to survive? | - Every living thing needs water, a place to live and food to survive. - Most living things also need air in order to survive. |
| 2. Why is water a necessity for life? | -70% of most cells is made out of water. - Most metabolism chemical reactions require water. - Organisms need different amounts of water & get water in different ways. - Organisms can get water from the fluids they drink and the food they eat. - Humans can survive for about 3 days without water. - Metabolism = sum of all chemical processes that occur in an organism.
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| 3. Do all organisms need air for survival? | - Aerobic Organisms need air. (Most Organisms.) - Anaerobic Organisms do not need air. (Example = Some Bacteria.) |
| 4. What type of place do organisms need to live?
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- All organisms need a place to live that has
all of the things the organism needs to survive. - Some organisms need a large space, while others need a small space to live. - Limited space leads to competition. |
| 5. How do organisms get their food? |
- Not all organisms get their food in the same
way. - Producer = An organism that can make its own food by using energy from its surroundings. (Uses photosynthesis) - Consumer = An organism that eats other organisms or organic matter. (Doesn't use photosynthesis.) - Decomposer = An organism that gets energy by breaking down the remains of dead organisms or animal wastes & consuming or absorbing the nutrients. (Doesn't use photosynthesis.) |
| 6. What is homeostasis? |
- The maintenance of a constant internal state
in a changing environment. Example = Stable internal temperature. |