Answer:
Coal, natural gas, and petroleum are all fossil fuels that formed under similar conditions. Today, petroleum is found in vast underground reservoirs where ancient seas were located. Petroleum reservoirs can be found beneath land or the ocean floor. Their crude oil is extracted with giant drilling machines.
Explanation:
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Answer:
Oxygen and carbon dioxide!
Explanation:
Oxygen and carbon dioxide are uncharged small molecules that can freely pass through a biological membrane. :)
Through my research I found questions similar to this with matching choices and they are the following:
A)the membrane potential moves immediately to + 30m V
B)the potassium channels open
C)the sodium channels are inactivated
D)some of the sodium channels at the point of stimulation open
Among those choices, the best answer would be D) Some of the sodium channels at the point of stimulation open.
Placental. it provide oxygen and nutrients to fetus. whilst removing carbon dioxide and other waste products
