Why do phospholipids tend to spontaneously orient themselves into something resembling a membrane?

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

There are few cells in the body that do not undergo mitosis: most somatic cells divide regularly, some more than others. take for example the cells that line the digestive tract. these cells must be frequently replaced because they are constantly eroded by the movement of food through the tract. what mechanism(s) is/are in place to ensure that these cells are exact copies of the mother cell

Discuss how the research in this article shows how new technology and experimental methods can lead to changes in theories.what information did you include in your answer? check all that apply.