Can you take a closer picture please.
Two primary techniques to identify use cases are USER GOAL TECHNIQUE AND EVENT DECOMPOSITION.
Use case refers to an activity which a system perform as a result of the request input by a user.
User goal technique is used to determine the specific goal that must be perform by the system for the user; user goal technique identify all the users of the system and their goals for using the system.
The event decomposition is used to determine the event to which the system must respond.<span />
In shallow water, there is more sunlight to keep the organisms warm and more oxygen.
I believe the Answer is C. Herbaceous or wood stems because the stem, hold up the flower and leaves into the sun light for energy/food.