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.
|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?
||- 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
- 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.