Mark turned quickly, pivoting on his right foot, while he was playing basketball. he felt a sudden, sharp pain in his knee and found his leg would not support him well. when he tried to walk off the court, his knee wobbled sideways. based on this evidence, which of the following has he most likely injured?

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 of the following is an advantage of solar energy?

If a strand of dna has 35% thymine. what is the percentage of cytosine, adenine, guanine?