What level of organism is a horse

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

What's the waste product of electrons and pyruvate combining in fermentation?  

Interferons play a vital role in the immune system why are interferons so important?