Aprotostar is a. a region of space from which light cannot escape b. a small star that will continue as a main sequence star for hundreds of billions of years c. a star with a core of neutrons d. the stage after a star completes its main sequence existence e. the stage before a star becomes a main sequence star

What best describes the dropping height of a ball that bounces back up to a height of 45 cm

Migration is a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations c. select the best answer from above

When rutherford performed his metal foil experiment, he was surprised that most of the alpha particles