Will my son become agressive because he's being bitten almost daily at his daycare?

My 16 mo old is constantly getting bit. I know bites are to be expected sometimes but not all the time. On two seperate occasions he was bitten three times! I also happen to work the desk at the daycare. I've become very upset with one of the teachers and insisted that she wasnt watching closely enough. I feel that this is a ridiculous amount of biting and some of the bites could be prevented by watching the children closer, simply being closer to the biter(s), and handling certain situations like fighting over a toy before they escalate. Moreover, my child has been pulling hair, and HE actually bit 2 of the teachers just recently. My child has never bitten. I believe this happened because he has been bitten repeatedly. What do I do? Am I wrong to believe that some of these bites could be prevented?