Select all the correct answers. What are the two basic differences between DNA and RNA?
RNA is usually single-stranded, while DNA is usually double-stranded.
RNA contains uracil, while DNA contains thymine.
RNA is usually double-stranded, while DNA is usually single-stranded.
RNA contains thymine, while DNA contains uracil.
RNA doesn’t contain cytosine, while DNA doesn’t contain adenine.

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

What are the ingredients of oobleck?