Biology Crossword

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Across
  1. 4. The type of hypothesis that states there is no difference in variables
  2. 6. Pores on the underside of a leaf
  3. 7. The P-value we always use in biology
  4. 8. The principle given to describe the flow of blood and water in gills
  5. 9. Rate of diffusion = (surface area x concentration gradient)/distance
  6. 11. This is the volume of air in one breath
  7. 12. This is the site of gas exchange in fish
  8. 13. As volume increases, this always decreases
Down
  1. 1. Tissue in leaf where the most photosynthesis occurs
  2. 2. This is the site of gas exchange in animals.
  3. 3. This muscle contracts and flattens when you inhale.
  4. 5. Opening on an insect that allow gases to enter and leave
  5. 8. Impermeable substance that an insect's exoskeleton is made from
  6. 10. Statistical tests used to compare the difference of mean values.