Why do welders have to wear a protective shield to cover their eyes?​

To protect their eyes of course

Explanation:

If they dont protect their eyes and if something gets into their eyes, they could even be at risk of losing their eyesight, and other problems could occur so its very important that they protect themselves

Protects from radiation, flying particles, debris, sparks, intense light, irritation and chemical burns

emerald ash borer

the emerald ash borer is a green buprestid or jewel beetle native to north-eastern asia that feeds on ash species. females lay eggs in bark crevices on ash trees, and larvae feed underneath the bark of ash trees to emerge as adults in one to two years. hope this !

answer; polycythemia is the correct answer;