"Terrestrial life" refers to any form of life that exists or is adapted to live on land, rather than in water or the air. It includes all plants, animals, and microorganisms that can survive and thrive on Earth's solid ground. Full definition
Many biologists, intent upon scientific objectivity, are reluctant to see in the development of terrestrial life anything more than an unlimited proliferation of forms, all on the same level. (religion-online.org)
Extra terrestrial life just became that much more of a possibility. (riddlethos.com)
Since life uses the left - handed versions, this suggests terrestrial life as the source of these amino acids. (sciencedaily.com)