Child proof means that its child-approved, meaning that its made safe for children.
It wants you to explain why its a chemical change. Signs of chemical changes are formation of gas bubbles, cloudyness, change in color or odor.
Either fibrillation or Cardiac Arrest
A scientist collects data (information found by experimenting)
DNA ligase <span>s responsible for creating the covalent bonds that connect the sugar phosphate backbone of the new DNA molecules</span>