The united states gave much attention to environmental issues in the 1980s and 1990s. preservation efforts have included:

care of endangered species
maintenance of lands and parks
purification of the air
all of the above

uniform, random, and clumped.

explanation:

mark brainliest if this : )

lee and grant, both of whom held the highest rank in their respective armies, had known each other slightly during the mexican-american war (1846-48) and began their dialogue by exchanging awkward personal inquiries. characteristically, grant had arrived in his mud-splattered field uniform while lee had turned out in full dress attire, complete with sash and sword.

explanation: