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Earth’s biota were believed to be relative simple, slow-
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- What is the significance of the "Vernadsky Paradox" and the concept "that the earth is an energetically open, but materially closed system" from a microbial perspectiveLife is found almost everywhere on Earth, but can you explain why it is notdistributed evenly around the planet.Nitrogen is the most common element in the air. Why do bacteria play a role in the nitrogen cycle?
- True or false. The supercontinent pangaea formed about four billion years ago.Which sequence of events accurately describes the history of the planet (from oldest to youngest)? Eukaryotes appear, Oxygen increases in the atmosphere, Prokaryotes appear, Oxygen increases in the atmosphere, Eukaryotes appear, Prokaryotes appear Prokaryotes appear, Oxygen increases in the atmosphere, Eukaryotes appear Prokaryotes appear, Eukaryotes appear, Oxygen increases in the atmosphereHow do we know when oceans were first present on Earth?Why is the presence of oceans significant to the origins anddiversification of life?
- Which of the following describes the organisms and/or processes that were most influential in the creation of early Earth ecosystems? a. Extinction of animals and domination of plants b. Build up the greenhouse gas carbon dioxide c. Prokaryotic production of an oxygen rich environment d. Eukaryotic growthWhich step is the last in the formation of fossil fuels? Question 64 options: subjecting organic matter to extreme pressure subjecting organic matter to extreme heat and pressure incomplete decomposition of organic matter flooding swamps with seawaterIn their laboratory experiments of simulations of early Earth, Miller and Urey observed the abiotic synthesis of abundant amounts of DNA amino acids liposomes genetic systems Which of the following was probably NOT present in the primitive Earth s atmosphere (when life first appeared)? O2 NH3 H2O CH4 CO2
- Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false? A. By cyanobacteria B. By electrical discharges in the atmosphere C. By industrially synthesised fertilizer D. By denitrificationWhich of the following accurately describes the Hadeon Eon? Earth during the Hadeon Eon closely resembled the earth of today. Earth was extremely hot and molten in nature during the Hadeon Eon. Earth contains an oxygen-rich atmosphere that allows photosynthetic organisms to flourish. Life first appeared on Earth during the Hadeon Eon.Which of the following best describes a decomposer a.An organism that feeds on biological remains and breaks down organic material into its inorganic subunits b.An animal that feeds on small bits of organic material c.An organism that obtains energy directly from the environment and carbon from inorganic sources