<span>The answer is the option C. hypothesis. If the option A, confuses you, think that an experiment is not per se an explanation, it is just a way to run trials to determine something. Hypothesis are statements that establish a possible relations between facts but that are not proved. Then you can design an experiment to test the validity or not of the hypothesis. You should not make hypothesis that cannot be testable. </span>
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cell is the basic unit of life and it is the smallest unit of life also
many cells combine to form tissue and tissue combine to form organs
atom is the smallest unit of matter everything is made up of small units called atoms
Eat small, frequent meals, avoid heavy lifting, avoid drinking alcohol.
Answer:
Antigen-presenting cells
Explanation:
Class II MHC molecules are present on the surface of all the antigen-presenting cells. Some of the examples of antigen-presenting cells (APCs) are dendritic cells, macrophages and B cells.
The Class -II MHC molecules are formed in the endoplasmic reticulum of these cells followed by binding of antigen peptide fragments to these class II MHC molecules. The antigen-MHC II complexes are then inserted into the plasma membrane of these antigen-presenting cells.