Which step in cellular respirationhappens first?

Endoplasmic reticulum where proteins are built? What is the difference of 40 degrees north and 45 degrees north? Where does most digestive food enter your blood? Why is there a need to revised the curriculum from time to time? How does the law of conservation of energy apply to the sun-Earth system? Factors influencing the growth of food poisoning bacteria and fungi? Advantages and disadvantages with using of small cells in cellular systems? What are 3 abiotic factors of the grassland? How old is mt teide? What accounts for the way most traits develop in a organism? How many 100 gram tablets are needed to make 1 liter of a 25 percent of a solution? What is a example of a lagoon? What structures empty into left atrium? What is through flow in the water cycle? Is there UV rays in Antarctica in Winter? Is development and progress of biology going very fast? Why calamansi seeds move easily after squeezing the juice? How are the three isotopes of hydrogen similar how are they different? Why you minerals are important to an ecosystem? What happened to the diversity of colonies in this plates which made the hands after plate to have more colonies than the hands before?