Use what you know about relative dating to choose the correct answers from the drop-down menus. ethan determines that layer b is 3.5 million years old. due to the , he can estimate that layer a is years old.

answer; talc and gypsum;

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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wanswer:

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