Coal is solid rock that began as organic material that was deposited in a swamp. The formation of coal suggests that A. Geologic
processes continue over millions of years. B. Coal is made mostly of skeletal remains of animals. C. Coal is formed from magma that has solidified over time. D. It quickly becomes petrified when water is removed.
In summary, breathing is the process of inhaling and exhaling through our lungs. It brings oxygen into the body and expels unwanted carbon dioxide. ... Our cells perform cellular respiration with oxygen and glucose to make energy and carbon dioxide.
