Why does lack of oxygen result in the halt of atp synthesis? ?

Which type of bacterial reproduction is depicted in the diagram?

Which best describes the scientific method? a. a path of clearly defined steps that must be followed in a particular order b. a possible answer to a scientific question based on knowledge or research c. the recipe for how to conduct an experiment that must be followed precisely d. the process of hypothesis and testing through which scientific inquiry occurs

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome