Answer:carbon can be form naturally or artificially, both give energy by giving heat power.
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apparently their gonna use that test and the homework and our attendance to give us a final grade
<span>The organ that is home to alveoli, broncioles, and bronchi which are moist with mucus and line with cilia are the lungs. The lungs are used to bring oxygen into the body and carry it to the heart which in turn pumps it throughout the entire human body to all the other organs.</span>
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The Earth is essentially a closed system; it obtains lots of energy from the Sun but the exchange of matter with the outside is almost zero. Isolated systems can exchange neither energy nor matter with an outside system.
The Precambrian was originally defined as the era that predated the emergence of life in the Cambrian Period. It is now known, however, that life on Earth began by the early Archean and that fossilized organisms became more and more abundant throughout Precambrian time.
