Awhite blood cell engulfing a bacterium is an example of a white blood cell engulfing a bacterium is an example of exocytosis receptor-mediated endocytosis phagocytosis pinocytosis facilitated diffusion

It is an example of PHAGOCYTOSIS. Phagocytosis refers to the process by which the white blood cells engulfs a foreign body in order to destroy it. The white blood cells are the cells of the immune system that are responsible for protecting the body against infectious organisms and foreign invaders.

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.

Ithink the answer is d.