What makes brewing beer and making cheese examples of ancient biotechnology

How many chromosomes are in a human gamete?

Where does the esophagus lead to in a frog?

According to the article, what valid claim came from the national research council? there is no association between fluoride exposure and increased cancer risk in humans. there is a possible link between fluoride exposure and increased cancer risk in humans. there is a definite link between fluoride exposure and increased cancer risk in humans.