what are the steps of endocytosis?
['Endocytosis Step 1. The cell comes into contact with a particle.', 'Endocytosis Step 2. The cell membrane begins to wrap around the partile.', 'Endocytosis Step 3. Once the particle is completely surrounded, a vesicle pinches off.', 'Exocytosis Step 1. ... ', 'Exocytosis Step 2. ... ', 'Exocytosis Step 3.']