Think about what you need to stay alive. Consider how this might apply to yeast. Why do you think sugar was added to the yeast-and-water mixture?

In warm sugar water the yeast will grow and continue to feed on the sugar until it is all gone and as it does this it'll create waste products that are used both in beer and bread.

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