A. dermal tissue inhibits water loss.
The only joint-less bone in the human body is the hyoid.
Answer:
Repairing and replanting wetlands, creek beds, forestland, and other habitats. Eradicating invasive species. Replacing turf grass with native species. Planting rain gardens to absorb rainwater running off roofs or asphalt.
The wind and water work to erode the mountains.
I believe the answer is A.
I ruled out everything but C. and A. so it could be either.