Abattery-operated device was created to control the speed and rhythm of which human organ? stomach liver heart brain

heart

Explanation:

Pacemaker is a small microcomputer with integrated battery that lasts about 10 years or so (depending on usage). It senses the electrical activity of the heart through electrodes, which serve to keep the heart rate at a minimum frequency so as not to slow down, ie, a battery-operated device designed to control speed and rhythm. from heart.

People with a very low heart rate (less than 40 beats per minute) or breaks (heart failure where it has been beating for more than 3 seconds) or with some types of electrical block need a pacemaker.

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."