An increase in herbivory, an increase in intraspecific competition, and a decrease in the population of a major pollinator would all likely cause a decrease in the plant's population.
(An increase in herbivory, an increase in intraspecific competition, and a decrease in the population of a major pollinator; would likely cause; a decrease in the plant's population)
An increase in herbivory, an increase in intraspecific competition, and a decrease in the population of a major pollinator
would likely cause
a decrease in the plant's population