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An illustration of the helium atom, depicting the nucleus (pink) and the electron cloud distribution
Organisms can be classified according to their source of energy
Many ideologies stem from older theories. The ideas of the philosophers are simplified. Ideologies
The ethanol molecule showing two carbon atoms, six hydrogen atoms, and one oxygen atom.
Climate Change: Greenhouse gases Timescale
The heart and its major blood vessels. Oxygen-rich blood is pumped from the lungs to the left