I'm assuming this question is pertaining to
animal farms? Because I try to eliminate grass
from growing in my flower beds! :-)
My best answer is that unhealthy grass makes for
unhealthy animals who depend on it for nutrition.
Everything on a farm depends on soil. Soil
needs to have the right amount of elements
(nitrogen, for example) to support the plants
growing in it. If the plants don't have the
nutrition they need, they can't grow as well, and
the animals eating the plants won't grow well
either. Plants get their energy from the sun,
but still require essential elements to build the
parts they need for photosynthesis.
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