Answer quick im in the middle of a timed ! many plants can grow in the littoral zone of a lake because a. sunlight reaches its bottom. b. there are no algae. c. there are no animals. d. there is both salt water and fresh water.

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.

Asap. this question is 100 points if you answer it question: describe the basic relationship between ocean depth and temperature seen in the graph

Connection compare and contrast genetic engineering to the process of natural selection. select all statements that are true.