The producers at the beginning of the Earth's food chain are plants.
The major histocompatibility complex (MHC<span>) is a set of cell surface proteins essential for the acquired immune system to recognize foreign molecules in vertebrates, which in turn determines histocompatibility. ... The human </span>MHC<span> is also called the </span>HLA<span> (human leukocyte antigen) complex (often just the </span>HLA<span>).</span>
D a medium sized star because the largest star is canis majoris and the smallest star is brown dwarf..☺
A, none of them dissolves in water