An evolutionary biologist is studying the relationship between fish species. She studies undisturbed sedimentary rock layers at the bottom of the Atlantic Ocean. She observes that the fossils found in the bottom layer have a great degree of similarity to the fossils found in the top layer. Which statement best explains what the similarity between the two layers suggests about evolution? Fossils in the bottom layer were formed before those in the top layer. B Fossils are only found in sediments.

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Immune Disorders

The collaboration between the cells and proteins that work together as a defense system against infection comprises the immune system.Each of them performs a variety of tasks to recognize and/or react against a foreign body.