What element is a gas with a mass number of 19?

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

Discuss the functions of epithelial connective nerviud and muscular tissues

Which statement best describes the role of religion and culture in ancient medicine?