What is happening with the "lava" in lamp A? Explain your response. What is happening with the "lava" in lamp B? Explain your response. Relate your observations of lava lamp B to mantle convection and plate tectonics. What does the heat source of the lava lamp represent in the earth? What does the lava represent in the earth? If the lava lamp had floating pieces of foam at the top, what would they do? What would these foam pieces represent on the earth?

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.

Before the can be observed by using a transmission electron microscope, cells are sliced into very thin sections. what disadvantage does this procedure present in the study of cellular parts

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