They were created with stone and wood and sometimes even bones, I hope this helped!
True....
Explanation
Cells use oxygen to release energy during photosynthesis/chlorophyll/cellular respiration. For photosynthesis, the starting materials are water and carbon dioxide, and the products are sugar and oxygen. For cellular respiration, the starting materials are oxygen and sugar, and the products are carbon dioxide and water.
The correct answer is 30 seconds
Actual yield/theoretical yield x 100
The chemical change that involves breaking down substances using electricity is C. Electrolysis.
