The diagram bolow shows atoms that are all arranged into groups in the same way.
What does this diagram represent?
A
two different substances
B. a single type of substance
C. a single type of element
D. three different substances

answer; economic order quantity;

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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