The first thing to focus on when creating a workout plan is ?

What is the answer to this particular question i have in health

An _ exposure is a repeated or prolonged exposure(over months or years) that may bring about slowly developing symptoms.

Aresearcher lyses a cell that contains nucleic acid molecules and capsomeres of tobacco mosaic virus (tmv). the cell contents are left in a covered test tube overnight. the next day this mixture is sprayed on tobacco plants. we expect that the plants would ) develop some but not all of the symptoms of the tmv infectionb) develop the typical symptoms of tmv infectionc) not show any disease symptomsd) become infected, but the sap from these plants would be unable to infect other plants