Why does autumn start in different months of the year in north America and south America

Autumm starts in different months of the year because Earth's orbit around the sun is not a perfect circle. There are an equal number of hours of daylight and nighttime in the Northern Hemisphere because Earth's axis is not tilted in this position.

And also because there isn’t always gonna be a perfect 365 days in a year so that asdo effects it.

Explanation: hope that helps please make brainliest

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.