Cockroaches will eat any kind of organic material, they may eat (rotten) onions if that's what you meant.
what does the cockroach eat
my head
they eat small poppys
they eat carrots
bananas
Meat
Omnivores can eat all kinds of plant, as long as it is not poisonous to their system, such as the leaves of the potato plant.
Bread
Exoskeleton.
It has an exoskeleton.
all of them