A chromosome consists of a single, double-stranded DNA molecule. Chromatids are two molecules of double-stranded DNA joined together in the center by a centromere. Chromosomes have a thin ribbon-like structure. Chromatids have a thin and long fibrous structure.
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<span>The near extinction of many bird species was caused by:
Answer: </span>
<span> use of DDT
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Answer: Tissue that carries messages throughout our bodies is called nerves. Nerves conduct electrical impulses between the brain and brain stem to all parts
