Carbon shares 4 electrons to complete its valence shell
Yes it does, they are everywhere
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>
Photosynthesis. These are the reactants for photosynthesis and the products of cellular respiration.
Answer:
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