What is the MOST important factor in the changing of the seasons? a- the heating and cooling of land b- earths distance from the sun
c- earths revolution d- the tilt of earth on its axis

C because in order for us to change the earths tilt has to

Silicon is cut into tiny pieces for computer chipslead is melted to form pelletsliquid water freezes to form ice

Mitochondria produce atp, a high energy compound. atp is used for all sorts of enzyme-mediated reactions, such as making proteins/nucleotides/etc, certain compounds cross the cell membrane, muscles move, etc.  without this source of energy, a cell will die. it will not be able to repair itself, defend against pathogens, etc.