The very high levels of Iridium at the KT boundary was confirmed in different parts of the world and supported an already existing hypothesis, a supernova had caused the extinction. How was this hypothesis tested? • Scientists looked for planetary evidence of a supernova • Scientists ruled out all the other hypothesis and only the supernova was left • Scientists tested the amount of plutonium in the KT boundary • Scientists studied craters from ancient asteroids 2) How was community feedback important in developing the asteroid hypothesis? • Working alone allowed Walter to remain unbiased • Scientists working together were able to

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A: The evidence is given below.

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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.