Why is the immune response faster after vaccination than the
response that occurs the first time a pathogen invades?

after a vaccine is injected the body creates an immune response that produces memory cells so next time a pathogen invades the body is prepared

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:

the dark variety, as they are not visible on the dark tree barks

explanation: