Organisms with 23 different chromosome pairs can produce gametes with 8 million possible chromosome combinations, an incredible amount of genetic variation. This
many chromosome combinations in the gametes is possible because of which of the
following?
O thousands of different types of DNA base pairs.
O random separation of chromosomes during meiosis.
O mutations that lead to more chromosomes in the gametes.
O crossing-over that occurs during mitosis.

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:

c. live where it’s cold and icy