Answer:
Many fossils of organisms that are no longer living have been discovered.
Explanation:
Mass extinctions could be first identified because of the traces they left in the fossil record. In the strata, the lower, older rock layer shows a diversity of fossil life forms, and the younger lawyer above is depauperate if we compare.
1) One way is through radiographs. Scientists have studied the spectrum that distant nebulas give off and they have managed to identify molecules that can be found in there. Among them there is hydrogen and various nitrogen and carbon molecules; even alcohol has been found some of them. Another way is by sending probes to asteroids that check not only for simple organic molecules but also aminoacids and nucleotides. A third way was the Urey Miller experiment. There, some basic atoms that can be found in space (nitrogen, hydrogen and carbon) where put together with a spark in a flask. The mixture turned brown and produced complex organic molecules quite soon. This finding makes a case for complex organic molecules being produced in space and thus it is possible that they were transferred to Earth.
2) Geothermal vents are a source of hot water and raw nutrients such as sulphur. The main theory about the genesis of life around vents is that the cells started exploiting the pH or the thermal gradient near those vents and thus had a way to produce energy. The experimental set up for this is a chemical garden, an environment that simulates those alkaline and metallic conditions and yields hollow, plant-like structures. Also some metals in the vents are great catalysts for chemical reactions in organisms. Also fossilised microbes have been found beneath such vents.
The answer is C. The Experiment!!!!!
Fossil fuels are cool thanks
Answer:
75% = = 0.75
20% = = 0.20
0.8% = = 0.008
Explanation:
75% means "75 for every 100". This can be represented as . To convert to decimal, move the decimal place 2 spaces to the left: 75% would become 0.75
20% means "20 for every 100". This can be represented as . To convert to decimal, move the decimal place 2 spaces to the left: 20% would become 0.20
0.8% means "0.8 for every 100", but it's easier to understand if you write it as "8 for every 1000". This can be represented as . To convert to decimal, move the decimal place 2 spaces to the left: 0.8% would become 0.008
Hope this helps.