Sickle cell anemia results from the 6th amino acid in the hemoglobin protein being valine instead of glutamine (glutamic acid). What physical change / results does this cause in red blood cells?

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Ry was studying two populations of the same species of lizards. one population lived on an island and the other lived on the mainland. both populations were affected by a hurricane that hit the island and the mainland with equal force. a year later, henry was testing the gene frequency and saw a decrease in genetic variation in the island species, but not in the mainland species. which best describes a conclusion he might have reached? gene flow greatly affects small populations, but large populations can recover. genetic drift greatly affects small populations, but large populations can recover. gene flow greatly affects large populations, but small populations can recover. genetic drift greatly affects large populations, but small populations can recover.

Eutrophication caused by human nutrient pollution.

When ash and dust begin to settle on the ground, they eventually become compacted by