as Question 21 Match the mechanism to acquire carbon and energy with its name: I
ID: 189615 • Letter: A
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as Question 21 Match the mechanism to acquire carbon and energy with its name: I Choose ] Harvest energy from light and obtain carbon from organic molecules Harvest both, cnergy and carbon from organic molecules Harvest energy from light and obtain carbon from inorganic molecules Harvest both energy and carbon from inorganic molecules Chemolithoautotroph t Choose ) Chemoheterotroph Choose) Question 22 2 pt When life first appeared the atmosphere had no oxvgen. Thus. you can expect that the first living formsExplanation / Answer
21. Photoautotrophs are organisms that use light as energy source and CO2 as carbon source. Using light and CO2, these organisms synthesize nutrients by the process of photosynthesis. Cyanobacteria are the examples of the photoautotrophs.
Photoheterotrophs are organisms use light energy and organic substances as carbon source.
Chemoautotrophs use inorganic carbon as energy and carbon source. These organisms can fix carbon. The green and purple sulfur bacteria are chemoautotrophs.
Chemoheterotrophs are organisms that depend on organic carbon for using as both the energy and carbon source. For example, N2 can be used as an energy source and CO2 as a carbon source.
3. Mass extinctions cause the disappearance of various species from environment at once. This may result in reduced diversity. The interactions among species in a community become complex and many of the beneficial adaptations are lost from community. Predators may gain power in a community rather than any other species. options 1, 2, 3 and 4 are correct.
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