Scientists use critical thinking skills throughout the process of research or experimentation. a student notices that their energy level always seems to decrease when they drink soda, but they seem to have more energy when they don’t drink soda. the student decides to conduct an experiment to determine if their soda intake really does have an effect on their energy level. what critical thinking step has the student just completed in the situation described above?

Here by critical thinking students are asking a question. They are forming a hypothesis that is without drinking soda they have more energy than when drinking soda. A hypothesis is testifiable and falsifiable. To test a hypothesis experiments are conducted following the scientific method. The results of the experiments are analyzed and conclusion are drawn.

nanotechnology is a powerful tool in biomaterials research as it creates numerous possibilities for the engineering of functional molecules. nano-bio refers to projected ability to incorporate biomimicry into various materials at nanoscale.  

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.