Why is it important in a sandwich elisa that the antigen has multiple epitopes? and why might it be advantageous to use polyclonal antisera rather than mab in this assay?

The energy needs of a human population are not affected by

The united states produces an average of 429 billion pounds of food annually. about 133 billion pounds of that food ends up as waste.the percentage of food that the united states wastes each year is %.

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays