I believe it is A.Simple epithelia form impermeable barriers. If I am not right I'm really sorry. I don't really know much about it :)
QUESTION:- The sun shinning on thr surface of a lake can heat up the air just above the water.What happens if this air gets warmer then the air above it?
ANSWER:- If the air gets warmer then the aur above it then the air will go above then the air above on it .
REASON :- It is a rule of wind that it flows from hidh density to low density.
HOPE IT HELPS YOU.
Tears and mucous membrane are part of the General defense
system. The General defense system of the body consists of the skin, clotting,
sweat glands, lysozyme, mucous membranes, nasal hairs, cilia, hydrolic acids,
and the vagina. General defense systems have a vital role in giving barriers to
stop bacteria in entering our body which will make us sick.
Disaccharides form when two monosaccharides undergo a dehydration reaction (a condensation reaction); they are held together by a covalent bond. Sucrose (table sugar) is the most common disaccharide, which is composed of the monomers glucose and fructose.
