Fossilized stromatolites (A) formed around deep-sea vents. (B) resemble structures formed by bacterial communities that are found today in some shallow marine bays. (C) provide evidence that plants moved onto land in the company of fungi around 500 million years ago. (D) contain the first undisputed fossils of eukaryotes.
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Fossilized stromatolites a. formed around deep-sea vents. b. resemble structures formed by bacterial communities that are found today in some shallow marine bays. c. provide evidence that plants moved onto land in the company of fungi around 500 million years ago. d. contain the first undisputed fossils of eukaryotes and date from 1.8 billion years ago.
Stromatolites (pictured here) are rocky structures that generally form in shallow waters from the binding of sediment by bacterial microbial biofilms. Stromatolites are typically hypothesized to be formed from the presence of cells that bind these grains together. If the cells that formed the stromatolites were fossilized with these rocks, an analysis of these cells would likely include which structures? A) DNA, nucleus, and ribosomes B) Mitochondria, DNA, and ribosomes C) Plasma membrane, nucleus, and DNA D) Plasma membrane, DNA, and ribosomes
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Findings from layers dating to the Cambrian geological period show an appearance of many new organisms in addition to older forms of life. The Cambrian explosion corresponds to a time where _____. a. New species radiated from existing species. b. New species appeared due to spontaneous mutations. c. Ancient species were replaced by newly evolved species. d. A massive die-out freed ecosystems for new species.
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