Biology

12345678
Across
  1. 2. All living things are made up of at least one of these
  2. 3. the planet we live on
  3. 5. something that increases in size
  4. 7. these structures produce energy for the cells
Down
  1. 1. the study of the natural world
  2. 4. needs blood to pump
  3. 6. type of a plant that grows underground
  4. 8. the invisible mixture of gases everywhere