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Coccyx is the bone formed by fusion of caudal vertebrae in human beings.
The skin helps to keep the body warm by;Vasoconstriction that is less flows to the skin less heat lostMetabolic rate increase heat production.Shivering an involuntary contraction of skeletal muscles to generate heat.
Functions of proteins in the human body include;form the structure of animal fossilskeratin in haircollagen in tendons and ligamentsform myosis in musclesform enzymes and hormonesform casein in milksource of energy during starvation
Disadvantages of using caves as shelters during stone age period include;Caves could collapse over themWild creatures would bite themHuman enemies could easily attack themCaves were exposed to cold/ Floods
Ways by which afforestation helps in land reclamation include;Binds soil particles/improves soil structureHumus improves soil fertilityTraps eroded materialsWind breaker