How do bacteria cause disease? A. A bacterium releases harmful proteins or other poisons into the host's body
B. A bacterium injects its DNA into the genome of a host cell.
C. A bacterium replaces the host cells with bacterial cells.
D. A bacterium reproduces inside a host cell and causes the cell to break open

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