Electron affinity is the measure of how tightly an atom's nucleus holds it's valence electrons. have a strong electron affinity and have a weak electron affinity.

it would be d. henry moseley

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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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