Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. What process maintains the levels of oxygen and carbon dioxide in the atmosphere?
   • The levels in the atmosphere are maintained by photosynthesis.
2. Why is photosynthesis important?
   • the dependence of almost all life on Earth on the ability of photosynthetic organisms, such as plants and algae, to use sunlight in photosynthesis to build organic molecules that are an essential Energy store and to maintain levels of oxygen and carbon dioxide in the atmosphere - Energy transfer from sun to plant, chloroplast transform atoms rearranged (conserved in reaction). Oxygen we need for respiration = glucose.
3. Why is oxygen important in the atmosphere?
   • Oxygen is need for respiration which releases Energy from glucose. This is essential for all life. Therefore all life depends on the Energy from the sun and the photosynthetic
4. Which gas is used as a sign of life on other planets?
   • Oxygen is a sign that life is on an other planet.