A student thinks that erosion caused by water flowing downhill makes hills steeper. Which of the following would provide data that might support her idea? A. building a model of a hill out of dirt
B. observing water flowing in a river through a flood plain
C. slowly pouring water over a model of a hill made from dirt
D. measuring how much rain falls on a hill for a week

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.

What in scientific term why the salty popcorn causes this thirst

The first generation of offspring from the cross of two parents is called the a.f1 generation b.f2 generation c.short generation d.p generation