You are setting up your own lab, where you plan to study proteobacteria. You have narrowed your research focus and decided that you are most interested in the role of proteobacteria in the global nitrogen cycle. Which species of proteobacteria should your researchers study? Check all that apply. a. Alphaproteobacteria
b. Betaproteobacteria
c. Epsilonproteobacteria
d. Deltaproteobacteria
e. Gammaproteobacteria

The answer is b)Betaproteobacteria and e)Gammaproteobacteria

Explanation:

Nitrification, which is defined as the microbial oxidation of ammonia to form a nitrate, plays an important role in the global nitrogen cycle. There are two different groups of bacteria that can oxidize ammonia, as a first step in the nitrogen cycle. These groups are known as the Beta-proteobacteria (genera Nitrosomonas and Nitrosaspira) and the Gamma-proteobacteria (genus Nitrosococcus).

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.

i'd say that the moon rock is about 2.2 billion years old.