How do nephorns help in purification of blood

Which of the following can refer to the form of exercises that uses free weights, weight machines. resistance bands, or the weight of the body to put stress on the muscles ? (a) strength training(b)weight training(c)resistance training(d) all the above

Blood cells bring oxygen to cells and take carbon dioxide away. true or false

What kind of wound occurred when the skin scrapes against a hard surface and tiny blood vessels break in the outer layer of skin