According to the theory of global warming, the average temperature of earth’s air began rising rapidly when humans first started burning fuels such as oil. burning these fuels releases carbon dioxide into the air. scientists have observed that carbon dioxide traps heat from the sun in earth’s atmosphere. they have also observed ice melting in some areas.

which part of the scientific cycle does the graph directly represent?

a. experiments
b. xplanations
c. questions
d. facts

I'd say the answer to this on is d.Facts as they are using the temperatures in the graph and the temperatures are not just estimates

D. Facts

Explanation:

A scientific cycle is a detail procedure which involves the pattern of some phenomena, making a hypothesis, making predictions based upon the hypothesis, testing the prediction on the basis of the experimental procedure, making conclusions and framing the result.

According to the given situation, D. Facts is the correct option. As the graph is directly describing the statistical output of the comparative analysis of the increase in global temperature per year due to increase in abundance of the carbon dioxide in the atmosphere.  

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