Active Transport<span> is used when substances are to be transported against their concentration gradient ( from low concentration to high concentration ) by utilising energy from ATP.
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eg - Na+/K+ pump.
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They must be separated to the point that their genetic makeup changes so that they can no longer breed.
Scientists believed that it was HYDROGEN GAS that was used up before the oxygen gas become abundant in the atmosphere. Research shows that, millions of year ago, carbon dioxide was the most abundant gas in the atmosphere and that there is no oxygen at all. As time goes on and the earth mature, oxygen come into existence.
Answer:
In the human body, amylase is predominantly produced by the salivary glands and the pancreas.
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Nuclear fuel is a substance that is used in nuclear power stations to produce heat to power turbines. Heat is created when nuclear fuel undergoes nuclear fission. Most nuclear fuels contain heavy fissile elements that are capable of nuclear fission, such as uranium-235 or plutonium-239
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