Trilobite fossils are some of the most fossils due to their ease of fossilization and long period of existence. Trilobite species walked along the ocean floor causing them to easily be covered by sediment. Trilobites existed for over 271 million years, longer than the dinosaurs and humans combined. These characteristics provide humans with a large amount of fossil evidence for trilobites. Which statement below best describes the cause of the arrangement of smooth and spikey trilobite fossils observed in the fossil record above?

Most of the fossils found in virginia are in the coastal plain, valley, ridge, and appalachian plateau regions, best suggesting that these geographic provinces a) were once covered by seawater. b) are the oldest parts of virginia. c) have a great deal of karst topography. d) have large amounts of sedimentary rock.

Cold case files recently began re-investigating an old murder case. the murder took place in the park; a young man, james, was hit over the head with a brick and killed. police suspected the jealous former boyfriend of james' wife, karen. whoever killed james may have washed their hands in a near-by bird bath as detectives found blood in the bird bath. since the murder took place before dna fingerprinting was available, the suspected killer, ronnie, went free. detectives are now reviewing the blood evidence using dna fingerprinting. based on the dna fingerprints of all possible suspects, who is james' killer?

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