Covalent bonds: View Available Hint(s) Covalent bonds: always result in equal distribution of electrons between the atoms. involve the sharing of one to three pairs of electrons. involve the sharing of 8 pairs of electrons. always result in slight electrical charges at different atoms.

Cis the

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The population of unionid mussels decreased after zebra mussels were introduced. zebra mussels competed with the unionid mussels for food. the zebra mussels were able to displace the unionid mussels, allowing the zebra mussel population to increase  over the years. the unionid mussel population decreased because  of lack of food.