Astronomers define star<span> brightness in terms of apparent </span>magnitude<span> (how bright the </span>star<span> appears from Earth) and </span>absolute magnitude<span> (how bright the </span>star<span>appears at a standard distance of 32.6 light years, or 10 parsecs).</span>
It allows the scientist to determine the effect of the changed variable , it also allows samples and organisms to be tested under comfortable conditions
At the smallest level of organization, the DNA wraps itself around small globular proteins called histones. Complexes of histones and DNA form nucleosomes, which appear as "beads" on the DNA strand. Chromatin refers to the decondensed DNA that has not formed separate chromosomes.
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D) Pressure from water that flows into the plant cells
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