Final answer:
Plants have developed apical meristem tissue in roots and shoots as an internal adaptation for life on land.
Step-by-step explanation:
One internal adaptation that plants have developed for life on land is an apical meristem tissue in roots and shoots. Apical meristems are groups of undifferentiated cells that are responsible for the growth of plant structures. These meristems contain stem cells, which can divide and differentiate into various types of specialized cells, enabling the plant to grow and develop new tissues. This adaptation allows plants to continuously produce new roots and shoots, allowing them to explore and exploit their terrestrial environment.