Eat colorful fruits and vegetables, like berries, broccoli, carrots, etc. Don't stare at a screen too close, and take a break every hour. Drink lots of water, and try to look far distance.
1) macrophages
2) lymph nodes
3) thymus
4) bone narrow
I think the correct answer from the choices listed above is option A. Stress response can keep you alert and sharpen your concentration. This is because short-term stress response can keep your body ramped up and prepared for physical action and a short-term increase in bodily function (those related to flight and fight) is present.
