Omnivores have teeth that are... A. sharp for piercing.
B. dull for grinding.
C. both sharp and dull.

I would say the answer is C: Both sharp and dull.

Explanation: Omnivores eat both plants and animals so they would need sharp teeth to hunt and dull teeth to grind down plants and other vegetation.

hope this helps you (:

i think that d. wind is the answer.   i missed the question when i answered a. currents.

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.