Question

HELP??? I need help with science homework...
digestion in cows is different from digestion in humans because
A cows don't have a digestive system
B cows digest food outside of their bodies
C cows excrete excess salt from their food
D cows have four stomachs to digest tough fiber
please help and give explanation

Answer 1

This is D. Actually, the cows have only one stomach, separated in four compartiments : http://www.animalcorner.co.uk/farm/cows/graphics/cowstomach.jpg

Answer 2

Each compartment have a different fonction. They are four : rumen, reticulum, omasum and abomasum. The abomasum is similar to the human stomach. The omasum absorbs water and nutrients, the reticulum is really small and deals with metals and stuff. Read more here : http://en.wikipedia.org/wiki/Cattle#Anatomy
Basically, the cows' digestive system divides the task into small tasks. This is why the cows are ruminants.