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Question: please help me answer question 2 above the first page...

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Please help me answer question 2 above the first page and questions 1-4 for figure 2.3. Thnks In advance
2. A 10 kilogram meteorite is collected in space and brought back to Earth. It is composed of 1.25 kg of uranium-238 and 875 kg of lead-206. How many U-238 half lives have passed? Whati he speroainate ooth Using Figure 2.3, determine the age of certain rock strata by using both relative and radioactive dating methods. Use the following geological principles to help you answer the questions Stenos Principle of Horizontality-Layers of sediment are originally deposited horizontally under the action of gravity oldest on the bottom and the youngest on the top. The geologic feature which cuts through another s the younger of the two features Stenos Principle of Superposition-Sedimentary layers are deposited in a time sequence, with the Unconformity- If the sedimentation process is suspended by the emergence of an area from below the water level no sediment will be deposited and an erosion surface will develop.This gap in the geologic column is called an unconformity. An unconformity is typically shown in cross section by a wavy line. shale and siltstone volcanic ash erosion surface limestone sandstone. erosion surface slate granite Figure 2.3: Cross-section of rock strata. 1. Which is older, the limestone or the basalt dike? Justify your answer. Evolutionary Observations Exercise 2
2. If the slate layer contains a large number of trilobite fossils, and fish fossils are very rare, what is its probable age? If the volcanic ash on top of the limestone layer is radioactively dated as 230 million years old, and the limestone layer contains both sharksteeth and trilobite fossils, estimate the probable age range of the limestone. 3. 4. Based on the types of rocks and fossils found in this geologic column, and their arrangement what was the nature of the environment in this area of the world during the first half of the Paleozoic (600-300 million years ago)? How are Organisms Structurally Similar? When examining internal structures of different species, you may notice there are similarities in the skeletal structures of some appendages even though the appendages have different functions. These types of structures are referred to as homologous structures, and they have been derived from common ancestors. Analogous structures have the same function but are not derived from some common ancestor. Vestigial structures provide evidence of some past function. For example, some snakes have a remnant pelvic girdle. This pelvic girdle was used to attach appendages that snakes no longer have. are structures that seem to have no apparent use, but Procedure Examine the structures in Figure 2.4 and answer the following questions: humerus ulna radius carpala phalanges Bat Dolphin Sheep FLYING SWIMMING RUNNING GRASPING Figure 2.4: Bone structure and appendage function.
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