Each member of the electron transport chain is lower in free than the preceding member of the chain, but higher in the molecule at zero free energy, which is is lowest of all the molecules in free energy and highest in electronegativity.

the population of unionid mussels in the hudson river decreased after zebra mussels were introduced. zebra mussels, a nonnative species, competed with the unionid mussels for food. the zebra mussels were able to outcompete the unionid mussels, allowing the zebra mussel population to increase dramatically over six years. the unionid mussel population decreased due to a lack of food.

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