D, active transport because that protein uses atp to cross channels and active transportation is the only form of movement that’s used atp to move
Answer:
It requires energy
Explanation:
In the coupled transport system, coupled carriers couple the inward transport of one solute across the membrane to the outward transport of other solutes across the membrane. The tight bonding that occurs between the transport of two solutes allows these carriers to utilize the energy stored in one solute, usually an ion, to facilitate transport of the other. With this way, the free energy released during the movement of an ion down an electrochemical gradient is utilized as the driving force to transport other solutes inwards, against their electrochemical gradient.
Answer:
The air would be too thin for most helicopters to create enough lift to remain airborne. And if somehow a helicopter did make it up there, landing wouldnt be easy.
