1. The process by which living cells release energy from food is called:
  1. respiration
  2. digestion
  3. photosynthesis
  4. condensation
2. Friction is a force that always acts to:
  1. oppose motion
  2. make light
  3. create gravity
  4. speed up motion
3. A community of living things together with their environment is called a(n):
  1. circuit
  2. molecule
  3. ecosystem
  4. atom
4. Which gas is needed for burning (combustion) to take place?
  1. nitrogen
  2. carbon dioxide
  3. oxygen
  4. helium
5. All matter is made up of tiny particles called:
  1. bones
  2. waves
  3. atoms
  4. cells
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