| A | B |
|---|
| Water | Factor used for most chemical reactions in a cell. Materials can be transported. |
| Buffers | Solutions that remain at a stable pH regardless of how much base or acid is added. Way to control pH. |
| Metabolism | All of the chemical reactions in a cell. |
| Carbon dioxide | Necessary for photosynthesis in the chloroplast. Without it, photosynthetic organisms cannot make food. Too much can change the pH level. |
| Oxygen | Necessary for aerobic respiration (release energy from food) in the mitochondria. Type/number of organisms in water depends on the amount of how much of this is dissolved in the water. |
| Enzymes | Protein that controls reaction rates. Work best at a specific pH and temperature. |
| Light | Necessary for photosynthesis in chloroplast. Change in this affects photosynthesis. Maintains Earth's temperature. |
| Toxins | Poisns that can produce disease conditions, damages tissues, or interferes with life processes. Natural ones are produced by organisms. Synthetic ones are man-made. |
| Radiation | Energy traveling through a space. Can cause cancer or mutations. Includes ultraviolet light (UV), x-rays, and cosmic rays. |
| Temperature | Measurement of how hot or cold something is. Increase it-->increase metabolism. Decrease it-->decreases metabolism. Too much-->decreases metabolic rate and affects enzymes. |
| Cancer | Cells divide too quickly which may form a lump called a tumor. Can be caused by radiation. |
| Mutations | Can result from radiation. Are changes in a gene which can cause cells to produce the incorrect protein. Harmful if it reduces survival/reproduction. Helpful if it increases survival/reproduction. |
