What causes stress mostly for teenagers but of all ages also

What are phobias? and what are 5 common phobias that people have?

Synovial fluid serves as a lubricant to prevent friction between two parts that move on each other such as in the case of and bones.

What are hormones? a. they are minerals needed for proper bone formation. b. they are the parts of the body targeted by endocrine glands. c. they are substances needed for muscle and nerve activity. d. they are substances released by endocrine glands.