Answer:
Sand
Explanation:
Space, water, energy, and air are all needed for an organism to survive. Sand is just somewhere an organism could accustom to live in that environment.
Periosteum is the thin yet tough outermost layer of bones. Its many collagen fibers support the bone and firmly connect it to the surrounding structures. Osteogenic cells in the periosteum play a vital role in the growth and repair of bony tissue.
Answer:
The wildlife sanctuaries are established to protect the endangered species. A few sanctuaries take in injured and abandoned animals and rehabilitate them to health before releasing them in the forest. Wildlife sanctuaries preserve the endangered species and protect them from humans and predators.
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