It avoids describing similar concepts more than once, thereby saving you time and making the ER model more readable. It also adds more semantic information to the design in a form that is familiar to many people.
<em>Hope this helped! :)</em>
The major goal of conservationists would most likely be described as using land wisely and managing it for the future (A). However, conservationists would also support all of the other provisions in support of this goal such as establishing parks and public lands in towns and cities, leaving vast acres of land untouched, and teaching natural sciences in schools.
I believe it was the significant drop in temperature that caused the Ice Age.
