How do antibodies help to fight infections?

Antibody tests can detect the presence of antibodies in the blood that

Antibodies, also known as immunoglobulins (Ig), are specialized proteins that bind to a uniquely shaped object—called an antigen—that is found on the surface of a pathogen. These pathogens can be things such as bacteria or viruses.

with a fitted molecular shape—and then either destroys the pathogen or tags it so other immune cells will recognize it.

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.