Aerobic respiration occurs in three stages: glycolysis<span>, the </span>Krebs<span>cycle, and </span>electron transport<span>. In </span>glycolysis<span>, glucose is </span>split<span> into two molecules of pyruvate. This </span>results<span> in a net gain of two ATP molecules.</span>
The correct answer is the second choice - peer review process in scientific research exists in order to verify that the conclusions that are made are supported by the data. You cannot make a valid conclusion if you do not have enough evidence or data to prove it - this is why your peers have to go through your research to make sure everything is done according to the rules of scientific research.
Hope this helps.
Not sure but i think cohesion forces
Valence shell
The number of electrons in the outermost shell of a particular atom determines its reactivity, or tendency to form chemical bonds with other atoms. This outermost shell is known as the valence shell, and the electrons found in it are called valence electrons.
