What is a major land feature formed through weathering and erosion by the Colorado River? O Grand Canyon
O River basin
O Landslide
O sinkhole
O Pikes Peak
Question 5
20 pts
The geological process by which material is added to a landform is called?

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 sex and generation combinations directly produces the pollen tube of angiosperms? a) male gametophyteb) female gametophytec) male sporophyted) female sporophyte

Question#29: why does the tropical ocean have a greater temperature range than the temperate ocean?