The cells that are produced by the immune system are manufactured in places around the body. for example in the lymph nodes and the spleen. however. an infection can occur anywhere in the body. how do these cells manage to move around the body and get to the sites of infection a. there are lymph nodes every few millimeters all over the body. b. they are excreted and-float freely around the body. hunting infections. c. they are carried around the body in the circulatory system. d. they are moved around the body as muscles squeeze against them. question: why is a, b, and d wrong?

Acar company is testing seatbelts using crash test dummies. the company finds that when cars come to a sudden stop, the crash test dummies' bodies continue to move forward. the seat belt keeps the crash test dummies from hitting the back of the seat in front of them. why do the crash test dummies' bodies continue to move forward even though the car stopped? a. the friction opposing their bodies' movement keeps them in motion. b. the inertia of their bodies keeps them in motion. c. the forward acceleration of the car keeps them in motion. d. the gravity pulling on the car keeps them in motion.