What roles does progesterone play in the feedback mechanism

Alaska and northern canada have a diet rich in vitamin d and their skin color is darker than predicted on the basis of iv intensity at their latitude. explain the observation:

Brainliest ! which would require more force to move or slow down between a bowling ball and a soccer ball? explain why?

Casts and mold are a type of preservation where the original material decays, leaving a mold in surrounding rock that can be filled with another sediment a. true b. false