D, a net transfer of energy
B.
Key word: slide
Think of sliding down a WATER slide.
I attached a picture showing how to do it
Answer:
A. Chemical modification may allow for extended drug capacities such as expanded spectrum of activity and increased stability.
Explanation:
Any modification in antibiotic structure and chemical will affects its ability in a way to increase it capability of target microbes and act efficiently. These modification can increase half life and stability of the drug.
Gas molecules across the membrane
It can be water molecules as well