As they acquire seniority, they are promoted to managerial or supervisory positions. Some doctors establish their own clinics while others become instructors at medical schools or university hospitals
Start by lying on your back. Bend your knees at a 90-degree angle, with your feet flat on the floor. Put your fingertips on the back of your ears. Your elbows should be bent and pointing out at your sides. Lift your torso up as close to your thighs as possible. Do this with a smooth, steady motion, keeping your feet flat on the floor. When you’re done lifting your torso, your lower back should be off the floor. Lower your torso down to the floor so you’re back in the starting position.
Answer:
B. system
Explanation:
An example of a system would be the circulatory system helps circulate blood carrying nutrients to organs and waste material away from organs. It includes the organs - heart, blood vessels and lungs.