Tropism mostly refers to as_______?A. Bird migrationB. Directional growth of a plantC. Longevity of animal speciesD. Behavioral pattern of human 0 0 votesArticle Rating Subscribe LoginNotify of new follow-up commentsnew replies to my comments Label {} [+] Name* Email* Label {} [+] Name* Email* 0 Comments Oldest Newest Most Voted Inline FeedbacksView all comments