8. how does regular exercise to reduce the effects of mental stress?
a. regular exercise has been shown to reduce the physical effects of stress
b. people who regularly exercise are happy people and are fun to be around
c. regular exerase gives you better mental disopine so you're better able to ignore stress
d. regular exercise gets you away from the home or ofice and away from stress
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desss9

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