How long can humans hold their breath underwater?

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

How does photosynthesis show the conservation of mass and energy?

This connective tissue consists of large round densely packed cells with the nucleus pushed to one side.