How can a change in one element of an ecosystem affect the overall function of that ecosystem? Discuss changes in an ecosystem that you have observed or read about in your state. 

Minimum of 250 words

Here is our text book:

 Essentials of Environmental Science, 2nd edition (2015), Friedland, Andrew, Relyea, Rick,
published by W. H. Freeman (2015)
ISBN-13: 978-1319065669
ISBN-10: 131906566X