Ok, so i am not entirely sure how to get the answer to any of these questions. any ?

Explanations provided below

Explanation:

1. The first graph shows us that between 800,000 BCE and 2015 CE, the atmospheric concentration of carbon dioxide was fluctuating between 170 ppm and 300 ppm periodically, meaning it would achieve a maximum value, then drop down to a minimum value and the process would repeat over years by negligible changes in the maximum and the minimum values.

However, of 1950 to 2015 CE, we see a steady exponential growth of the atmospheric concentration of carbon dioxide strongly exceeding any other peak values seen in the trends before.

2. Similar patterns are seen in evolution of sulfur dioxide gases as well, as sulfur dioxide is another gas causing environmental problems (acid rains) which increased in concentration significantly after industrial revolution.

3. We may conclude that in the following years, the levels of carbon dioxide will remain to rise, as it reached its greatest value throughout the ages and is still rising exponentially.

4. Notice that we see the rise from around 1850. This was caused by the industrial revolution and an excessive usage of machines and power plants, as well as production of the first cars, which all contributed significantly to the amount of carbon dioxide released into the surroundings.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

the answer to this question is 3.