Given a scientific question, generate a correct answer to it.

Example Input: A plant is composed of two main types of tissue: meristematic tissue and what other kind of tissue?
Example Output: permanent tissue

Example Input: What do you call a predator species that affects other species' populations when its own population size changes?
Example Output: keystone species

Example Input: Which division of the peripheral nervous system carries messages from sense organs and internal organs to the central nervous system?
Example Output:
sensory division