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During the first month of development, how many layers of cells make up the embryo? a. 1 b. 2 c. 3 d. 4
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Why do rna viruses appear to have higher rates of mutation? a) rna nucleotides are more unstable than dna nucleotides.b) replication of their genomes does not involve proofreading.c) rna viruses can incorporate a variety of nonstandard bases.d) rna viruses are more sensitive to mutagens.
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Which basic safety point should be reinforced when a school-age child is left at home alone?
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