Which cell type is essential to the immune response?

White blood cell

Explanation:

White blood cells also known as leucocytes are the cell type that include lymphocytes, neutrophils, basophils, eosinophils and monocytes. All the classes of white blood cells play vital role in immune response.

Thus, White blood cell is the answer

Geological Process

Explanation:

The lithosphere is the strong external layer of the Earth's outside layer, including rocks, sand, and soil. The Earth's lithosphere is a powerful territory, with procedures, for example, disintegration, tremors, and plate tectonics  continually changing and shaping/crushing the surface.  The biosphere is divided in  three sections, called the hydrosphere and lithosphere and hydrosphere.  A biogeochemical cycle is the pathway or stream of components among living things and nature. Since issue is rationed known to mankind, it is reused all through the biosphere.  The biosphere is characterized as the zone where both living beings and the results of their exercises are found. So it assumes a significant job to keep up the biological systems, that is the life of living beings and their shared cooperations. biosphere is imperative to direct the atmosphere.