What is the best example of how the nervous system maintains homeostasis a. the parasympathetic system counteracts the sympathetic system. b. the spinal cord returns the body to homeostasis after the brain reacts. c. the peripheral nervous system conteracts the central nervous system d. the brain prevents the reflex arc from happening in the body

A

Explanation:

A. The parasympathetic system counteracts the sympathetic system.

Explanation:

Homeostasis refers to the tendency of organisms to maintain the steady state, that is, to maintain the constant internal environment.  The parasympathetic division of autonomous nervous system serves to control the internal organs of body and maintains the resting state by conservation or restoration of energy. The sympathetic division serves to mobilize the energy during emergency conditions and prepares the body for fight and flight conditions. Hence, antagonistic effects of these two divisions maintain an internal body balance.

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

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