Such as A - coma.
A very extreme side effect or rather end effect of depressants can be, besides the mentioned loss of coordination, slurred speech, etc. also coma.
This can happen in very extreme cases and also only in a small percentage. Coma as a side effect is usually (And of course) not desired.
The answer would be d. the population has increased and so has the demand for energy sources
A is direct variation because the line does not curve and x and y are in a direct ratio
Bacteria containing nucleic acids