How can hiv/aids be transmitted from one person to another without having any form or sexual contact and why

The part of the nephron provides initial filtering of the blood in the urinary system.

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?