Answer:
A. They added speed and power to atlatl throws.
Explanation:
Bird stone are ancient stone carvings in form of bird that do serve a particular purpose as it commonly attached with a placed where someone was buried. Also, there are studies that shows that it could be part of a tool used by spear throwers (Atlati) in order to ensure that, their spear travel long distance when the spear is attached on the bird stone head and thrown from there.
