Because the higher the food chain gets, the less energy is being transferred , therefore, there are less organisms at the top of the food chain.
Experimenting. Experimenting is used in all three main branches of science, physics, chemistry, and biology, and is used in all the sub-branches of science, like marine biology, to make discoveries. Without experimenting, all we know about science would be random guesses.
The atomic number where as the atomic mass refers to the number of both neutrons and protons and the symbol refers to the element
Pretty sure it's D, hope I helped
