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Geosciences LibreTexts

2: What is life?

  • Page ID
    6175
  • We only know life from Earth, which makes it difficult to define objectively. As scientists, we use what we know as a model, e.g. life on Earth. These readings help us understand what life is and how we classify it in the context of the evolution of life on Earth - with an understanding that it could be different elsewhere in the Universe.

    Thumbnail: Several types of photosynthetic bacteria (Cyanobacteria) that grow in Antarctic lakes and form pinnacles.