“any process used to ask and answer testable questions about observations of the natural world” defines which term?

The correct answer is scientific inquiry.

Explanation:

A cooperative and coordinated effort to illustrate, search out, foretell and explain the natural appearances is termed as a scientific inquiry. Scientific inquiry advances via a spontaneous procedure of data collection, examination, assessment, and interpretation.  

The scientific inquiry is a systematized methodology to discerning nature. It looks to provide empirical proof of natural incidences so that scientists can spontaneously elevate their knowledge of the natural world.  

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy

allowed for the prediction of the properties of missing elements.