Anyone help me ?:)

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

How does the fermentation of pyruvic acid in cells contribute to the formation of atp? a. it completes the oxidation of glucose to co2, creating atp. b. it generates lactic acid, which cycles back through the krebs cycle, producing 2 atp molecules. c. it converts fadh2 to phosphate, which bonds with adp. d. it produces 2 nad+ molecules, which cycle back to fuel the glycolysis reaction, allowing 2 atp molecules to be produced.

Jellyfish sometimes squeeze in the sides of their bodies. this pushes a stream of water from the back end of their bodies. according to newton’s third law of motion, how will this behavior affect of the jellyfish ?