Cells

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Across
  1. 1. An attractive force that holds two atoms together
  2. 4. a strong, rigid structure that surrounds the cell membrane of a plant cell; it provides support and protection; animal cells do not have cell walls
  3. 7. The process used by all living cells to release energy
Down
  1. 2. the lower part of a microscope, which stops it from tipping over and contains the light source
  2. 3. the smallest living part of an organism; the basic building block of complex (multicellular) organisms, though some organisms consist of a single cell; most cells are microscopic, so are too small to be seen with the naked eye
  3. 5. Energy required to break bonds to start a chemical reaction
  4. 6. microscopic organisms forming one of the six kingdoms of living things
  5. 7. a gas found in the atmosphere; used by plants in photosynthesis and produced by all living things, including humans