Ice is the frozen form of water. it is colder due to the water needs to be 32℉ or 0℃. in order to freeze and become ice.
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Mutation, forms entirely new alleles, the other answer choices change preexisting allele distribution within the population.
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Igneous rocks form as magma cools below ground or lava cools on the surface. Sedimentary rocks are made from the eroded particles of other rocks or from mineral deposits left when water evaporates. Metamorphic rocks form when any existing rock undergoes intense and prolonged exposure to heat and pressure.
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<span>A property of t cells, but not b cells, is their </span>ability to form cells that directly kill virus-infected host cells.