The primary difficulty is the fact that we do not know all of the organisms that currently exist in the world along with those that existed in the past.
"REPRODUCTIVE ISOLATION" needs to occur for speciation to happen.....
The supporting structure of the cell that is also involved in movement is most likely the cytoskeleton.
2NH3 is equivalent to N2 + H6 since the 2 at the beginning gets distributed to both atoms. Knowing this you can rewite the equation as
H2 + N2 = H6 + N2
The N2 can cancel out leaving
H2 = H6
You now have to ask ‘2 times what equals 6?’ The answer is obviously 3 at this point.
Answer: C. 3
