Based on the scenario, the client who behaves the way he is
in the scenario is likely to behave in a way that his expression of feelings
are being controlled. It could be seen from the way that he is trying to keep
it in despite of the struggle or the scenario that he has experienced.
1. More nutritious
2. More efficient growing
for example, they can be resistant to droughts or rough winds or pesticides.
I haven't taken biology since my freshman year of high school, so this is kind of a guess. But I know for sure it isn't a solid. So I would go with a gas.
The same ligand can bind to different receptors causing different responses (e.g.. acetylcholine). On the other hand, different ligands binding to different receptors can produce the same cellular response (e.g. glucagon, epinephrine).
