Cell membranes are semi-permeable. That is why they can allow only some substances to enter the cell. It basically depends on the size of the molecules. Smaller atoms like water can easily pass through. However, macromolecules such as sugars, oils and proteins cannot easily pass because they contain a long chain of monomers.
Answer:
A rotting log is nonliving. However, it can have mold, lichen, or fungus growing on it, which is not the log itself. Those three things are living. And though the log was once a living tree, at it's current state, it is nonliving.
I hope this was helpful!
Carbohydrate is the macromolecule responsible for quick energy
I think all of the above( or maybe I’m wrong) because producers commonly are plants, but also can be bacteria or protists. Plants are always multicellular, while bacteria and protists are unicellular. Primary consumers that consume producers, like us(humans) are multicellular. But, since organisms that obtain their energy from other organisms are called consumers. ... All animals are consumers, and they eat other organisms. Fungi and many protists and bacteria are also consumers.
[ If you don’t count in the bacteria, protist, or fungi (all unicellular) then I guess it could also be only producers?]