Answer:
Option-C
Explanation:
The oxygen revolution refers to the increasing concentration of oxygen in the atmosphere around 2.3-2.4 billion years ago.
The studies have suggested that before the oxygen revolution the Earth's atmosphere was full of the hydrogen sulfide and methane gas in which the anoxygenic prokaryotes were evolving.
The cyanobacteria and other photosynthetic bacteria evolved the photosynthetic pigments which performed the experiment and oxygen gas was produced as a by-product.
With time this oxygen got accumulated in the atmosphere and the oceans and became one of the factors of anaerobic prokaryotic, the condition which they cannot escape. Later the oxygen producing prokaryotes evolved and formed the first eukaryotes.
Thus, the selected option is the correct answer.
Answer:
First, “fire suppression” is the act of extinguishing or fighting fires, while “fire exclusion” is the defacto policy of trying to eliminate fires from the landscape using fire suppression techniques.
Answer:
The type of layout that would be used to construct such rooms is:
fixed-position layout.
Explanation:
With this type of layout, the life support systems for each room will not be moved from one room to the next. Each room will have its own specialized equipment and systems so that only the workers and some test materials will be moving into and out of the separate rooms. There are other types of layout, including hybrid, process, and product layouts. Fixed-position layouts are more appropriate for systems and equipment that are too large or too heavy to move or require separate use to reduce contamination.
Answer:
Chlorophylls do not absorb wavelengths of green and yellow, which is indicated by a very low degree of light absorption from about 500 to 600 nm. The absorption spectrum of β-carotene (a carotenoid pigment) includes violet and blue-green light, as is indicated by its peaks at around 450 and 475 nm.
Explanation:
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Phosphorus cycles between living things and the Soil
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