Darwin’s theory of evolution offers a scientific explanation for which of the following? A. how genetic information is inherited
B. changes in species over time
C. human effects on biodiversity
D. the age of Earth

Use this diagram of an animal cell to answer the question. where does the first stage of cellular respiration occur? w x y z

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.

The terrestrial planets are characterized by having a a.) silicate core b.) iron-rich silicate core c.) iron-rich metallic core d.) none of these