1.which activity would you predict is most likely to have the smallest impact on environmental systems? a. using more land to grow corn that is used to produce fuel b. using land to create a national park c. building a dam for energy production d. building new housing in an area far from a city

The correct answer is option B, that is, using the land to create a national park.  

National parks refer to big areas of public land set aside for the native animals, plants, and the habitats in which they thrive. The national parks safeguard the places of natural beauty and are home to various endemic species.  

National parks are in real sense safeguarded regions, conserving biodiversity is the central aim for such protected areas. The national parks offer a safe home for the local animals and plant species, they also help in keeping the water and air clean.  

b. the carbon cycle ensures living things have a source of hydrogen