Which of the following statements is true? choose one:

a. most climate scientists believe that current temperature increases are due entirely to natural cycles of short-term climate changes.
b. the worst-case scenario predicts that if global warming continues at its present rate, by 2050 the average annual temperature will have increased from 15°c to 20°c.
c. the intergovernmental panel on climate change (ipcc) has ruled that all future research use the one computer climate model that it has concluded is the best.
d. carbon dioxide concentration of the atmosphere has increased in the last century.

Carbon dioxide concentration of the Atmosphere has increased in the last century

Explanation: Due to a significant boom in the industrial age in the last century, the extra carbon dioxide concentration has been significantly increased in the atmosphere thereby causing an enhanced greenhouse effect. This is due to the emission of carbon dioxide by most Industries.

answer: associative property of addition

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the precambrian aged rocks could be found in australia. australia is a region that has a lot of ancient civilization history from million years ago. in this region, there are a lot of recognizable fossils buried in its land which is considered a precambrian-aged rocks