Breathing is usually controlled subconsciously by the respiratory center at the base of the brain. Breathing continues during sleep and usually even when a person is unconscious. People can also control their breathing when they wish, for example during speech, singing, or voluntary breath holding.
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Answer:
Heterogeneous
Explanation:
Sand may appear homogeneous from a distance but it is heterogeneous.
C)Fossil Aging, I think...
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Answer : Hydrogen.......:
The answer would be a dangerous process, this is because the greenhouse effect traps gasses such as CO2 and other harmful gasses emitted from the Earth, that can ultimately lead to problems in the future.
The greenhouse effect is also the reasoning behind why scientist believes in Global warming and climate change.
Plus, the greenhouse effect is neither natural, new, nor artificial.
