Chromosomes can exchange genetic information during a process called "crossing over." this occurs when homologous chromosomes are lined up in pairs.
when does this happen?

Ronald wants to see if a new shower cleaner works better in removing soap than his old cleaner. he uses the new cleaner on one half of the shower tiles and his old cleaner on the other half. identify the independent and dependent variables in this experiment. enter your answer in the space provided.

Plants consume most of their carbon from a. the soil b. the water c. the roots d. the air

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?