1. Which of the following is an example of a scientific theory? A. The law of gravity

B. an explanation of how disease spreads

C. an untested hypothesis about the structure of DNA

D. E =mc2

Awater molecule is polar because there is an uneven distribution of these between the oxygen and hydrogen atoms.

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

Which strategy is an example of how companies may upgrade themselves to meet changing customer preferences? a.doing door-to-door sellingb.using billboards to advertise the productsc. making online shopping services availabled.giving discounts on products