How does kidney stones affect the kidney

Assume that a student is given two different models of bacteria, with one model consisting of big bacteria and the other consisting of small bacteria. how can the student demonstate the theory of endosymbiosis using the models

All living organisms are composed of a. only one cell. b. at least 100 cells. c. at least three cells. d. one or more cells.

Ais a landform that is formed at the mouth of a river from the deposition of sediment carried by the river as the water flows.