If your job requires you to use a respirator, your employer is required to do three things. what is missing from the list?

The photo below shows four different types of respirators: two filtering facepieces, a half-face respirator, and a full-face respirator. All of these respirators can work as filtering respirators, but only the half-face and full-face respirators can carry a chemical cartridge.

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek