The goal of basic science is:
o
a. to understand the world around us.
b. to apply a new technology to an old problem.
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c. to design a new product.
d. to solve a specifichsroblem.
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Air enters through the nose (and sometimes the mouth), moves through the nasal cavity, the  pharynx, the  larynx, enters the  trachea, moves through the  bronchi  andbronchioles  till the alveoli.

Wheres the rest of the answers to the question?

Yes yes yes very good

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.