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What is the type of contaminant that can cause foodborne illness

During his workout yesterday, anthony pushed himself by lifting heavier weights. today he is feeling good, but his muscles are sore. what principle is at work in this situation? a. specificity b. progression c. overload d. reversibility

Avirus consisting of a single strand of rna, which is transcribed into complementary dna, is a ) proteaseb) retrovirusc) rna replicase virusd) nonenveloped virus