Any grass plant would have weak stems because they are not woody. However, "cow grass" does not exist rendering this question moot.
weak stem
There is no such thing or grass species as "cow grass."
Not at all. Grass is eaten by a cow, not produced by a cow.
Fire is weak to Water Water is weak to Grass Grass is weak to Fire
No. Cows EAT grass. They do not "have" grass.
Yes.
Orchids have strong stems.
Cow's graze on grass to feed as they can easily digest grass.
The cow eats grass is a correct sentence.
Cow.
No
No, a cow eats grass.