Asteroids, small airless bodies within the inner solar system, are theorized to have contributed water and chemical building ...

Read at the annual meeting of The Massachusetts Medical Society, June 10, 1913.

This is a preview. Log in through your library . Abstract Degradation of urinary nitrogen-containing compounds by bacteria in the ceca of birds occurs in a number of herbivorous and omnivorous species ...

There are four bases: Adenine and Guanine (purines); Cytosine and Thymine (Pyrimidines). Purines have two carbon-nitrogen rings while pyrimidines have a single carbon-nitrogen ring. Thus, there are ...