Answer:
The answer is A.
Explanation:
Phylogenetic trees are only concerned with hard data (time points of when species evolve) and not soft data like how great a species is.
B) Oxygen may not have been able to accumulate in the atmosphere
Carbon is the best answer while other elements can be sodium, Lithium, or sulfur. It combines with hydrogen easily, and is the basis for all fossil fuels and organic materials.
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
