The A horizon is the best for plant growth, because is has more organic material and more organisms that make the soil more fertile than the deeper layers, and the soil is not loose like the O horizon.
the A horizon
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Involuntary muscles are the muscles that move without conscious control of the organism and are controlled by the autonomic nervous system.
Some examples of this are:
• the ,cardiac muscle, (,heart,)
,
• smooth muscles,, like the ones found in the ,stomach,, ,intestine,, and, bladder.
