Hydrogen is a likely candidate in the search for a replacement for petroleum. however, removing hydrogen from water requires the investment of a great deal of energy. why are plants considered to be one step ahead in the utilization of hydrogen as an alternative fuel source?

answer; ///i believe the answer your looking for is (ribosomes);

genetic variation will increase because of a new habitat and food source.

explanation:

carbon traps heat so more of it makes it hotter causing global warming. during the ice age carbon levels in the atmosphere were low so it got very cold. so the common things between them is carbon levels in the atmosphere.