Your heartbeat is created when the muscular walls of the heart
vibrate
O expand
O contract
O None of the above

Which of the following statemens is not true about the consequences of alcohol?

In the category column, classify the following activities as either health promotion or health protection. if any of these actions fall under both the categories, write both. in the reason column, write down your reason for making each classification.

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