The rumen, reticulum, abomasum, and omasum are all parts of the A monogastric stomach
B animals reproductive system
C carnivores stomach
D ruminants stomach

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

i think that it is c, d, and e, hope this

condenser is used to focus in the light microscope.

carbon traps heat so more of it makes it hotter causing global warming. during the ice age carbon levels in the atmosphere were low so it got very cold. so the common things between them is carbon levels in the atmosphere.