What is unusual about the immune response to diseases like bovine spongiform encephalopathy?

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.

How much serem is need to make kids?

What is the hormone in your brain that makes you feel happy?