Define the term “fitness”

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

To maintain asepsis when administering an injection, all parts of the syringe can be handled except the:

Which was most likely an effect on society that resulted from improvements in blood handling during world war i and world war ii?