What do humans need in order to survive

Which of the following represents a negatively charged ion? of t 7

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 macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes