Which statement about leptin is true

Employers are required to provide guardrail, safety net, or personal fall protection systems to protect workers from falling off unprotected sides/edges of residential roofs that are feet or more above a lower level.

What are your thoughts on nonhuman trials? do you feel that testing should be done on animals? what are the advantages and disadvantages with nonhuman trails?

The hazard communication standard has requires that each container holding a hazardous chemical have a warning label that is easily seen . what information must the label contain ?