Scientists on a fossil expedition in the Florida Everglades excavated an area with four strata (layers). Z Hawthorn Group Y Tamiami Formation X Undifferentiated sediments W Miami Limestone W Y Z They found vertebrate fossils in all four strata: 124 fossils in the Miami Limestone, 75 fossils in the Undifferentiated sediments, 138 fossils in the Tamiami Formation, and 62 fossils in the Hawthorn Group. The scientists concluded that the Hawthorn Group contained the oldest fossils. Is this a valid conclusion? Yes. The Hawthorn Group must contain the oldest fossils because this layer has the smallest number of vertebrate fossils. CYes. The Hawthorn Group must contain the oldest fossils because it is the lowermost layer of soil and rock excavated by the scientists. No. The Tamiami Formation must contain the oldest fossils because it contains the greatest number of vertebrate fossils discovered. No. The Miami Limestone must contain the oldest fossils because it is the uppermost layer, just beneath the water of the Everglades. The Everglades X

Describe how DNA evidemce might be used to confirm scientist's conclusion about any relationship between these organism. Humerus- Radius Ulna- Carpals- Metacarpals- Phalanges- Human Cat Нorse Bat Dolphin shutterstock.com 1603198606

According to Scottish geologist Charles Lyell, the Cenozoic Era (including the Eocene, Miocene, and Pliocene epochs) extended over which of the following time periods in the fossil record? the Paleozoic Era, from the start of the Cambrian into the Permian Period the “age of reptiles”, from 252 million years ago to 66 million years ago the “age of birds and mammals”, from 66 million years ago to the present day the “age of fishes”, from 541 million years ago to 252 million years ago the Mesozoic Era, from the start of the Triassic into the Cretaceous Period

Scientists are examining the possible role of a large asteroid in the cretaceous mass extinction event. A large asteroid strike would likely have caused rapid climate cooling and the diffusion of sunlight. which of the following statements are the best null and alternative hypotheses when scientists look at the geologic evidence of extinction related to the asteroid strike?

-How long is the time span between the appearance of free atmospheric oxygen and evidence of complex (multicellular) forms? -How much time is there between complex forms and the Cambrian Explosion?

2. The Paleozoic Era extended over which of the following time periods in the fossil record? A. the Cenozoic Era, from the end of the Cretaceous into the Tertiary and Quaternary Periods B. the "age of reptiles", from 251 million years ago to 65 million years ago C. the "age of birds and mammals", from 65 million years ago to the present day D. the "age of fishes", from 542 million years ago to 251 million years ago E. the Mesozoic Era, from the start of the Triassic into the Cretaceous Period

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After the Great Dying, we enter the Era which covers the evolutionary history of the dinosaurs up until they go extinct. Cambrian O Mesozoic Paleozoic O Cenozoic

Mammalian species possess an amniotic, a character state also inferred to have been present in the ancestor they share with Reptilia. Thus, this shared homologous trait is a______________of Mammalia. Group of answer choices symplesiomorphy synapomorphy analogy homoplasy      PreviousNext