Upton sinclair published his famous book titled in 1906.

The answer is option c

Answerthe paleolithic period;

List the choices below and i’ll u : d

Material safety data sheetswhen working with any type of chemical the should be posted in a conspicuous place in the work areamsdsif a material does pose a health hazard teachers shouldobserve appropriate precautions when they or their students handle the materialmsds are available fromproduct manufacturesmsds sheets must beavailable in shop/science classes at all times