As the number of organisms increase so does their tropic levels. As one organism eats the other energy is being transferred to that organism. The larger the food chain the lesser the organism' s would be because they would lose energy while trying to hunt and catch their prey and other activities. The food chain usually ends at the tertiary consumer or the fourth link because if it goes on like that there would be less energy hence these organisms would most likely starve and gradually die.
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Nitrogen 14 and nitrogen 15 differ because nitrogen 14 has 7 neurons and 7 protons. Nitrogen 15 has 8 neurons and 7 protons.
