1 billion years for oxygen to become a large component of Earths atmosphere
B A gene is a portion of a DNA molecule that codes for a protein.
Its not a protein nor RNA
Answer:
Food gives you energy, but oxygen is needed to break down the food into pieces that are small enough for your cells to use This is known as cellular respiration and it is the process of oxidizing food molecules, like glucose, to carbon dioxide and water
Yes, water is a polar molecule because the Electrons are NOT shared EQUALLY
