Which is a good source for calcium?
a)berries
b)legumes
c)root vegetables
...
Answers: 2
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True or false mucous membranes destroy pathogens on the outer body surface, at body openings.
Answers: 2
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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.
Answers: 3
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