Chain Crosswords Medium Chain Science Medium — Set 21

Medium 13×13 Set 21
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Across
  1. 1. A substance that living things need for energy and growth
  2. 4. A thread-like structure in cells that carries genetic information
  3. 7. To find the size, amount, or degree of something
  4. 8. When light bounces off a surface like a mirror
Down
  1. 1. The central part of a cell that controls its activity
  2. 2. A curved piece of glass that bends light
  3. 3. A test done to discover something new
  4. 5. A gas in the air that living things need to breathe
  5. 6. The remains of a plant or animal from long ago preserved in rock