Which of the following characteristics can be used to classify an organism into a taxonomic domain?
A) Being unicellular or multicellular
B) Mode of reproduction
C) Presence of nucleus in cells
D) Being heterotrophic or autotrophic

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