Lessons below address this concept: Life on Earth 3.8 billion years ago consisted of one-celled organisms similar to present-day bacteria. Found 2 records.
From soup to cells - The origin of life Delve into our current understandings of the origins of life and how scientists are able to investigate the details of such ancient events. This article is located within Evolution 101.
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Tutorial
It takes teamwork: How endosymbiosis changed life on Earth You might be surprised to learn that descendents of an ancient bacterium are living in every cell of your body! Find out how endosymbiosis factored into the evolution of your own cells.
