What is the major role of leptin in the body?

Fossils can only be formed when? if mud, silt or tar is in the area to preserve the fossil ierosion does not occur and allows the fossil to form oxygen and microorganisms cannot decay the bones the area is dry and does not contain mud or silt

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Mrna decodes information from the original dna master plan to build proteins in the during the process of ribosomes.