when someone talks about a population, they are talking specifically of humans living within a set area. If someone is talking about the organisms living in an area, they are speaking of living things within a set area. bio- meaning life and mass- meaning density of. density is not always speaking of weight. it could also mean how full. biomass means the amount of living organisms within a set area.
Since you did not give options, I will just help you out by saying that Implied Powers are powers that are <em>Not stated directly but are suggested to be true</em>
