1.   ...terrestrial life forms.

2.   As carbon dioxide levels fell, oxygen levels would rise, until they reached a point at which any terrestrial life other than mangroves might be endangered.

3.   A main constituent of red tides are algae, an ancient group of primitive plants dating to the first terrestrial life.

4.   But he scorns speculative schemes for saving terrestrial life from eventual destruction by the Sun.

5.   But those bacteria could have hurtled through space inside meteorites, providing the original forms of terrestrial life from which everything else on Earth evolved.

6.   Its future research goals include quantifying the growth rate of the colonies and sequencing their DNA, which could help connect them to the known tree of terrestrial life.

7.   The discovery complicates the question of when and how terrestrial life arose.

8.   The overwhelming preference of terrestrial life for left-handed amino acids over the right-handed kind is not likely to be explained soon.

9.   Their study for the first time offers precise estimates of the probable effects of a dying Sun on global climate and terrestrial life.

10.   Thus, nanobes call into question the minimum size requirements for terrestrial life.