Answer:
Grass (D) is an example of a pioneer species.
Step-by-step explanation:
Pioneer species are the first organisms to colonize a newly formed or disturbed ecosystem. Grass, with its rapid growth and ability to thrive in challenging conditions, often plays a crucial role in the early stages of ecological succession.
These plants are well-adapted to establish themselves in barren or recently disturbed environments, paving the way for the eventual development of more complex plant communities. Grasses contribute to soil stabilization, preventing erosion, and their presence can create a more favorable environment for the growth of other plant species.
Option D is correct.