Which of the following behaviors requires help from the nervous system? A. sensing heat B. swallowing food C. driving a car D. all of these

Yes yes yes very good

Ascientist will use that to figure out how or why things are the certain way they are i hope this

There are four nitrogenous bases that make up dna. the two pyramidines are thymine and cytosine. the two purines are adenine and guanine. these bases pair in a very specific way. adenine - thymineguanine - cytosine i remember it like this: a tall, good cat.