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C. Macrophages
When Macrophages approach a foreign pathogen they ingest the pathogens through phagocytosis, the Macrophages show the foreign antigen proteins on their cell surfaces.
The Helper T Cell recognizes the antigen on the surface of the macrophage and starts an immune response to the invading pathogen by sending out a chemical message
After that the B-cells produce antibodies that are specific to the antigens of the pathogens that slow them down so the macrophages can engulf them.
Answer:
Planck's famous black body radiation law
Explanation:
We measure the temperature of the universe by using Planck’s famous black body radiation law. This law states that every object radiates electromagnetic energy according to its temperature.
Therefore, "<u>Planck's famous black body radiation law</u> measures the temperature variations in the universe.
* I hope this helped :)