Kyrs has 2/3 of her homework finished which of the following does not have a different of 2/3

preservation because he preserves part of the land and preserves means save

explanation:

enhanced global partnerships and exploration capabilities may advance international preparedness for protecting the earth from catastrophic events such as some asteroid strikes, advancing collaborative research on space weather and protecting spacecraft by developing new means for space debris removal.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint