What engulfs particles at the cell’s surface

answer:

the plasma membrane engulfs fluid droplets or particles from outside the cell and pinches of a membranous sac called a vesicle inside the cell. the engulfing of large particles, including whole microorganisms by endocytosis. the removal of waste, or secretory materials by a process that is the reverse of endocytosis.

explanation:

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your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.