Marcus has really enjoyed high school. He is working hard to get his grades up. Some days he feels like he is doing it all, getting so much done, and can pile on more. Then he will have a few days where he is totally overwhelmed, withdrawn, and can barely manage schoolwork. That puts him behind, and he has to work twice as hard when he feels better. His parents are worried about his mental health. What mental illness might he be experiencing? A. Stress B. Depression C. Schizophrenia D. Bipolar disorder.

Bipolar disorder

Explanation:

to increase speed you need to decrease frictiona dn drag hense why sprinters wear tight track suits to keep tight against there skin to keep away from wind and decrease the amount of drag you are carrying.a swimmer will wear the tightest swim suit they can possibly fit into (i was a size 28 swim suit at meets i wore a   size 23) why? because the tighter your clothing is the less drag and negative force you have. the heavier the clothe the slower and more wind gets caught. cotton tends to hold onto alot of sweat and water making it slower then say a track suit (no idea what they are made of but they are really comfy around your answer )

there are men and women, some choose to be both or change their gender. often times those people go by "other". those who change their gender are known as "transgender"