| I: | Stem tendrils develop from axillary buds and help plants, such as pea, to climb |
| II: | Opuntia modifies its stems into flattened structures to protect itself from browsing animals |
| III: | Underground stems of some plants such as grass and strawberry spread to new niches and when older plants die, new plants are formed. |
| 1. | I, II, and III | 2. | Only II and III |
| 3. | Only III | 4. | Only I and III |