What do x and y chromosomes affect?

Need an answer asap 45 points and brainlest to the first person to answer why do scientific theories, such as biological and chemical evolution, represent the strongest explanation of the changes observed in the fossil record. must be in sentence form how can scientific theories on evolution and the fossil record change over time? must be in sentence form

Which process of living things produces water that enters the water cycle

How do specific cell structures and organelles contribute to maintaining homeostasis in the cell?