Water! It is the source of all life.
Explanation:
The similarity between tropic and nastic movement is - both are the result of external stimulus and the difference between tropic and nastic movement is the direction of the response is not dependent on the direction of the stimulus in the case of nastic movement but in the case of tropic movement, the response is dependent on the moment.
The answer is number 3 use this to help you : https://quizlet.com/118565169/nsg-6005-week-8-flash-cards/
