Which of the following is true regarding active transport

It occurs against Concentration gradient

Explanation:

Transport of molecules from lower concentration to higher concentration to maintain a steep gradient.

the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

explanation:

2%? i tried finding the exact sorry if it's not 100% correct ; -;