Potential energy and kinetic energy
The two main forms of energy are Kinetic energy and Potential Energy. Kinetic energy is motion energy. Potential energy is energy stored in matter.
the two main groups of plants are vascular(angiosperm) and non-vascular(gymnosperm)
Flora (plants) and fauna (animals).
producers and decomposer's and if you want a third parasites
Fossil fuels (coal, oil, natural gas) and nuclear fuel (uranium)
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