Scientist would build a model to observe what?

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.

Which of the following units is not an official si unit

Ill give u brainliest pls how is mass of carbon conserved during cellular respiration