<span>It has the advantage that only when the substrate is presence the genes responsible for its metabolism are turned on.</span>
It’s C
Why I know because I had to answer a question like that. Plus what you’re observing is the ice cube and a heterogenous mixture is one that is made up of more than one clearly identifiable phase of matter so picking C would show it’s a heterogeneous mixture
The function of the semi permeable membrane is to allow substances to diffuse (transport) across it, because its only semi permeable the substance are able to cross. If it was a non permeable membrane it wouldn't allow the transport of substances.
