What is the purpose of the underlined sentence in the passage? A to prove that fossil fuels are responsible for climate change B to explain why Earth’s average yearly temperature is rising C to clarify that greenhouse gases are not always bad D to provide a quote from a climate-change expert

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.

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.

Which of the following is a true statement? question 8 options: populations can't evolve, only individual organisms. individuals have adaptations that can change over time. individuals have traits that may or may not make them successful at reproduction. individuals evolve to have adaptations.