WILL MARK BRAINLIEST!

Why have improvements in microscopes over time resulted in revisions in the cell theory?

A. They have revealed new information about cell structure and processes.
B. They have made microscopes easier to use.
C. They have allowed scientists to share pictures of the cells being studied.
D. They have made it possible to confirm what scientists already suspected.

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.

How would you describe the the organisms in the second row of model 1 that are connected to the parents by a line

Aparent with freckles is crossed with a parent without freckles. the punnett square shows the possible genotypes and phenotypes of the offspring. which statement accurately describes the probability of phenotypes? a.the offspring are more likely to have freckles. b.the offspring are more likely to have no freckles. c.the likelihood of the offspring having freckles and not having freckles is the same. d.the likelihood of the offspring having freckles and not having freckles cannot be determined.