Which of the following pieces of evidence prompted researchers to abandon the hypothesis that a supernova caused the high levels of iridium in the K-T layer? Select one response. a. Coarse sediment mixed with uniform Cretaceous mud in Texas || b. Differences in foraminifera fossils above and below the K-T boundary layer c. High levels of iridium in the K-T boundary layer d. Lack of an isotope of plutonium in the K-T boundary layer

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Paleontology

A branch of science concerning the scientific study of life from ancient times is known as paleontology. The scientists working on paleontology are known as paleontologists. Paleontologists collect the fossils of organisms from ancient times to classify them. The paleontologists also study the environment from ancient times to study the interactions between different organisms.