Trey wants to improve the speed of his serve, which health-related component of fitness should he focus on? O Muscular strength
O Cardiorespiratory endurance
O Muscular endurance
O Flexibility

the last statement is correct i.e.

when your heart is not pumping enough blood around your body because your heart is severely failing, you may need an artificial heart. an artificial heart is a mechanical device, about the size of an orange, that is connected to your heart or implanted in your chest to or replace a failing heart.

chemical preservatives

alternate days of the week that you perform that activity