5. What is this passage mostly about?
A silk production and the revival of the silk industry
B how the silk industry improved the Thai economy
C the mysterious disappearance of Jim Thompson
D the argument of animal activists against silk production

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.

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun

How do you know that the plant cells in these two images have different jobs, or functions? a. because all plant cells serve different functions b. because they are two different colors c. because their dna are different d. because their structures are different