Key Stone America - Board Game Rules - how to play

About Keystone: North America – Second Edition, from BoardGameGeek:

In Keystone: North America, you and your friends will take on the role of biologists and work to build an interconnected ecosystem through the careful placement of cards. Use skills, introduce important Keystone animals, and perform wildlife research to maximize your points. Keystone: North America (Second Edition) offers multiple ways to play, updated rules and refined style! Go head-to-head against your friends in multiplayer and see who can build the healthiest ecosystem. Or experience a narrative adventure that will take you on a journey across North America with the Field Journal. This fully illustrated book contains a solo or co-op campaign where you will solve puzzles, learn about amazing animals, and explore the different ecosystems that make up North America. -description from the publisher