Which statement about an atom is true ? A. all the elements have only one nucleon (mass) number.
B. the nucleon (mass )number can be less than the proton (atomic) number.
C. the nucleon (mass) number can equal the proton (atomic) number.
D. the number of neutrons never equals the number of electrons with answer

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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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