The sickle cell allele is an example of which evolutionary force? how many base changes result in hemoglobin s? in which environment does possessing a sickle cell allele provide an advantage? what is the favored genotype?

This is due ! matching pairs of chromosomes from parents are called a. homologous chromosomes b. heterozygous chromosomes c. herterogenes d. homologous bands

How does friction with the atmosphere affect the speed of an artificial satellite

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat