Are designed to make it easier for employees to get health and safety information about chemicals.

Occupational safety and health administration’s Hazard communication standard is the design that makes it easier for employees to get health and safety information about chemicals.

Explanation:

well when looking at this if you think about it   negativley and positivley   react with each other and when the first layer gets full they add layers it starts with 2 on the first layer and it constantly goes on until the official number is there

with out the ancient ppl we wouldnt have medicine beacuse they taught us.