Primates are characterized by (a) forward-facing eyes, varied diet, and nonviolent behavior. (b) arboreal adaptation, dietary plasticity, and parental investment. (c) docility, toolmaking, and parental investment. (d) arboreal adaptation, dietary plasticity, and male dominance.

(D) arboreal adaptation, dietary plasticity, and male dominance.

Explanation:

The primates have developed hands and feet which allows them to grasp things, crawl and reach from one branch to another so as to grab food. This is an example of arboreal adaptation.

The dietary plasticity can be define as the ability of the organism to adapt to the given environment.

As all primates lives in a group there is always a leader who lead the entire population of a primate for gathering food and protecting themselves from danger. Thus male dominance is prominent in the group of primates.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.