It is a because it is the only logical explanation.
It is called T-lymphocytes. It assumes a focal part in cell-interceded invulnerability. Immune system microorganisms can be recognized from different lymphocytes, for example, B cells and common executioner cells, by the nearness of a T-cell receptor on the cell surface.
True, Methane is a greenhouse gas
It is 50% homozygous recessive, and 50% heterozygous