Some athletes now wear special shoes with spikes to get a better grip. what does this indicate

What are some misrepresentation of the human body?

Mucous membranes.. a. cover or line external surface of body. b. line internal body surfaces that are in contact with the environment. c. produce antibodies to combat infection. d. secrete sweat, which has antibacterial enzymes.

Arm circles are often effective dynamic stretches for swimmers because they