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which is a component of the biosphere ?
a.) permafrost
b.) mountains
c.) bacteria
d.) argon

An atom of nitrogen had seven protons in its nucleus. how many electrons does it have

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

How far down have geologists drilled holes ? (science) a: 3.8 km b: 12 km c: 100 m d: 1200 km