Which division functions to conserve energy and replenish the supply of nutrients?

Parasympathetic

The Parasympathetic system is the part of the autonomic nervous system which controls the rest and digests functions of the body. Parasympathetic system functions to conserve energy as it slows the heart rate, increases intestinal and gland activity, relaxes sphincter muscles in the gastrointestinal tract and replenish the supply of nutrients.

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i would say that hybridization occurs frequently in nature, because there are many types of hybrids that have occurred naturally, such as the mule (male donkey + female horse)

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this