A)Even though some reactions can occur on their own, a catalyst may the energy barrier required to complete the reaction. b)If combustion reactions produce Carbon dioxide and water, which are relatively harmless, how do other pollutants like CO and NOx form which need to be oxidized and reduced by catalytic converters? (hint, think in terms of stoichiometry).
c)Carbon Monoxide is and NOx is during these reactions.
d)Does the catalyst get used up during a reaction? Why is this convenient?

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.