Distance divided by time what is velocity

Lymphocytes known as blastocysts make antibodies that fight infection. select the best answer from the choices provided t f

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

Which two particles are found in the center of an atom