What does the surface area represent in a cell

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

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

If an organ has six haploid chromosomes,how many chromosomes are present. 6 12