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Polymerase chain reaction makes more copys of a single cell.
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<span>The correct option is A. SI unit is the standard measure by which a measurement is made all over the world. Length is a measurement, its SI unit is meter and the tool used to measure it is ruler. The other options are wrong because, temperature is measured in kelvin, weight is measured in kilogram and volume in cubic meter.</span><span />
<span>Organisms living near hydrothermal vents have no access to light so they get their energy from chemosynthesis.
C</span>hemosynthesis<span> is the biological conversion of one or more carbon containing molecules</span><span> and nutrients into organic matter using the </span>oxidation<span> of inorganic compounds</span> or methane as a source of energy. <span>Chemosynthesis is the process by which certain microbes create energy by mediating chemical reactions.</span><span>
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Physical anthropologist John Hawks and colleagues suggest that evolution is speeding up as population sizes are being continued to mushroom and new mutations which are endorsed.
Human population increased rapidly. The increase began those days of upper Paleolithic which is documented by archaeological evidence.
<span>Flakes or dry patches made up of excess dead epidermal cells are a known as scales. </span>
