I
State characterized by the ability to metabolize nutrients (process materials for energy and tissue building), grow, reproduce, and respond and adapt to environmental stimuli.
Fossil evidence suggests that earth's first living organisms, bacteria and cyanobacteria , arose about 3.5 billion years ago. All known life-forms possess either DNA or RNA . Drake equation .
II
[c mediumvioletred] (as used in expressions)
half life
life insurance
life span
mean life
{{link=still life painting">still life painting