Mass wasting occurs
1. sediment moves to a lower elevation, while rock moves to a higher elevation
2. sediment and rock moves from a lower elevation to a higher elevation
3. sediment moves to a higher elevation, while rock moves to a lower elevation
4. sediment and rock moves from a higher elevation to a lower elevation

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.

25. what does meiosis create? haploids or diploid? somatic cells or gametes?

Do you think the gene eef1 alpha1 supports cell theory? explain your response.