Formal is where you look nice and dress up informal is where you look causal.
an "amine" group, particularly a "primary amine"
A -CH3 group is called a methyl group.
Yes. Our local group of galaxies is made up of 3 larger galaxies (milky-way, Andromeda and M33) and several smaller or dwarf galaxies.
A control group is the group that is not being manipulated by the experiment. Often there is an effect of an expectation, so the control group is given a placebo which is similar to the...