Answer:
Active uptake (which I think you mean active transport) is important when the concentration gradient is against that of a certain substance, so it doesn't cross the membrane through diffusion or passive transport. It is sometimes necessary if a substance needs to move across a membrane but can't do so due to electrical charge or that there is a substance on the other side of the membrane preventing diffusion.
Explanation:
The Electrons would need to be in a covalent bond. Covalent means that the electrons are equally shared between atoms.
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<span>The group includes their common ancestor but also the seeded descendants of that same ancestor.</span>
