If memory cells are always present after the first exposure to a virus, then why do people get the flu
every year?

How do cells grow and reproduce to maintain homeostasis?

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

Bio molecules are essential to all living things. which biomolecule is “d” from the table