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What is the overall purpose of the menstral cycle

If your emotional energy is low, your attitude will likely a. be more negative. b. not be impacted. c. vary substantially. d. be more positive.

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.