Based on the information provided in this reading, what is the best conclusion that can be reached?
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Human activity is the cause of increasing global temperatures.
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Increased CO2 concentrations are the only cause for increasing global temperatures.
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Past and present data show a trend in increasing CO2 concentrations.
There is nothing that can be done to reduce global temperatures.

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.