Silicon readily bonds with oxygen and is rarely found in nature in its pure form. You've likely seen silicon as silicon dioxide or silica, better known as quartz, which is the most common component of sand.Silica also comes in other mineral forms, such as flint, jasper and opal.ilicon is the 14th element on the periodic table. It's a metalloid, meaning it has properties of both metals and nonmetals, and is the second most abundant element in the Earth's crust, after oxygen.
Heterophile antibodies are human antibodies with the ability to bind to animal immunoglobulins, thereby possibly interfering with the interaction between animal-derived antibodies and the antigen [hCG in our discussion], which are components of all immunoassays.
An example of an  autotroph is algae. A heterotroph is an organism that receives its  food from other sources. It is a multicellular or unicellular  organism. Organisms that are consumers or decomposers are  heterotrophs. A parasite is also a heterotroph. A parasite feeds  off other organisms for its food. An example of a parasite is a  deet tick. An example of a decomposing heterotroph is an earthworm.  An earthworm decomposes biological matter in soil for its food.