Answer: A gene is a sequence of nucleotides in DNA or RNA that encodes the synthesis of a gene product, either RNA or protein. A chromosome is a long DNA molecule with part or all of the genetic material of an organism. A allele is one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.
Explanation:
Before cells could be seen by using a microscope, people believed that diseases were caused by spiritual effects.
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because the snow releases thermal energy from the atmosphere to melt.
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