| A | B |
|---|
| Oscillating Universe Theory suggests | the universe may eventually contract |
| The amount of dissolved oxygen | depends on plants available for photosynthesis |
| Four components vital to life | proteins, carbohydrates, water and energy |
| Nitrogen + carbon + hydrogen + oxygen | = protein |
| Carbon + hydrogen + oxygen | = carbohydrates |
| Hydrogen + oxygen = | water |
| Oxygen + carbohydrates = | energy |
| Photosynthesis - sunlight is stored | in the chemical bonds of glucose |
| The function of the respiratory system | exchange oxygen and carbon dioxide |
