Science!!! :D

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Across
  1. 5. Protein matrix found outside cells
  2. 6. Element making up ~79% of the air that we breathe
  3. 8. Small section of DNA
  4. 9. Undifferentiated cell
  5. 11. Bone in upper arm (between biceps and triceps)
  6. 12. Tiny extremely resilient creature; also known as water bear
Down
  1. 1. Part of the brain responsible for processing emotions (e.g. fear)
  2. 2. Tree used as the precursor for aspirin; often found near lakes
  3. 3. Positively charged particle found in the nucleus of atoms
  4. 4. Closest planet to our sun
  5. 7. Central part of cell containing DNA
  6. 10. Insulating layer around some nerve axons; ______ sheath