Which of these is found inside our solar system? a galaxy b nebula c black hole d moon

Brainliesttt me asap! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false