1) Somewhere it billion years ago it was considered that there were no air , no earth , no sky , no sun , not even light . The universe was a highly dense and infinitesimally small lump . Suddenly,There was a big explosion.The"Big Bang ".And then was light . That probably was the beginning____ The beginning of matter,The beginning of light and the time !!.
2) The big crunch is a hypothetical scenario for the ultimate fate of the universe.
<h2>Hope this helps u :)</h2><h2>Not cheated nor copied answer .</h2>
The enzyme pepsin functions with a very low pH of around 2. It is found in the stomach, with the acidity coming from the hydrochloric acid present there. it breaks proteins into amino acids.
