Which is a characteristic of a person with positive mental well-being?

Which nutrient is the most difficult to break down and, thus, is generally used last fro energy in the body? water carbohydrates fats proteins

Causation can be proved by using an

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