alternative energy

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All of the following are classified as alternative energy sources EXCEPT-

Biofuels can be made from which of the following –

Almost all energy on earth originates from –

Alternative ---------------resources can be used to produce electricity. What fits in the blank?

The energy from the sun is most likely used for –

Solar energy is:

-----------------------are non-renewable energy sources that must be conserved. What fits in the blank?; ; ;

Biofuels are: