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Answer:
Common Camera hazards are dust, sand, non-microfiber cloths, oil, water, shocks, and blunt force. In order to avoid them, be sure to use lens covers, microfiber cloths, camera cases, camera jackets (can be improvised using a towel), and keep the neck strap on your neck.
Answer:
Biodegradable means it SHOULD be safe for the environment. Meaning it can break down into natural elements. However, this is uncertain as some materials don't break down as easily, with a possibility of not having much of a difference as non-biodegradable materials. It all depends on the product, but if we're going by the label, then by definition it's environmentally safe.