Answer:
The structure that allows redwood to grow tall and maintain homeostasis is the roots.
Explanation:
Homeostasis is the tendency of an organism to regulate its internal stability so as to compensate for external or environmental changes. A change in the environmental factor can easily cause s a constraint to an organism, but its homeostatic capability regulates the condition to that that is suitable to its internal stability.
Redwoods are one of the most tall trees that have shallow roots which spread over a wide area and intertwined oftentimes. With the shallow roots, redwood has a good homeostasis capability. They are very wide trees and can be found in thick groves.
Though they grow so tall and large in width, the roots are important structures that maintains homeostatics in the trees.
