Aboxer has been jumping rope for an hour. his leg muscles are burning, and he feels weak. which substance is the most likely cause of the burning he feels in his muscles?

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back