The somatic nervous system

a. provides motor signals and conscious control to skeletal muscles. b. provides motor neurons to cardiac muscle.
c. provides motor neurons to the stomach and intestines.
d. is dependent upon the autonomic system for control.
e. includes motor neurons to muscle within blood vessels.

a. provides motor signals and conscious control to skeletal muscles.

Explanation:

The somatic nervous system (SNS) controls the skeletal muscle movement, therefore is responsible for nearly all voluntary muscle movements, this happens by connecting the CNS with organs (brain and spinal cord) and striated muscles. It also processes sensory obtained bye external stimuli (hearing, touch, and sight). It also regulates reflex arcs (extremely quick muscle contraction)

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step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.