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Stromatolites are the ancient fossilized remains of layered communities of what? A. kelp B. photoautotrophic bacteria C. corals D. marine mosses E. haloarchaea While microfossils can be compelling evidence of early microbial life, their use has important limitations, including which of the following? Choose one or more: A. Conclusions are based on largely subjective interpretations. B. These formations are rare and usually derive from ancient terrestrial ecosystems. C. These formations tell us nothing about the size and shapes of early cells. D. Some formations result from abiotic processes. E. The earliest forms accepted as biogenic date only to about 500 million years ago. An organism's phylogeny describes what? A. acquisition of genes by horizontal gene transfer B. codon usage compared to other organisms C. chemical composition (percentage of C, N, P, etc.) D. genetic relatedness to other species E. genomic G+C content
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Which of the following organisms would show up after this organism in the fossil record of Earth’s geologic history? Artist rendition of one of Earth's earliest animals, Dickinsonia Group of answer choices Cyanobacteria microscopic image of cyanobacteria A trilobite A fossilized trilobite An early tetrapod An early tetrapod An early dinosaur A dinosaur standing on two legs with a tail in the air.
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Part III: Answer the following questions about cyanobacteria: Cyanobacteria were once called the because of their color, but they are prokaryotes. Many cyanobacteria contain special cells called that can perform the conversion of atmospheric nitrogen to usable forms. Explain what occurred during the Great Oxygenation Event. Part IV: Answer the following questions about the members of Kingdom Protista: How are bacteria and protists similar? How are bacteria and protists different?
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