Discovery Science: Earth – Biology – Evolution About 3.5 billion years ago, the first signs of life on Earth were single-celled bacterial organisms that lived in the primeval oceans. Single-celled animals and algae, as well as all multicellular organisms, evolved from these bacteria. This evolutionary process was limited to the oceans for many millions of … Read more
Discovery Science: The Origins of Life In the beginning, Earth was a boiling, fiery ball. Conditions improved gradually as it cooled down and eventually the primordial soup of inorganic compounds generated complex, organic molecules-the source of all life. A primordial atmosphere of hydrogen and helium existed even in the earliest phase of the Earth’s existence. … Read more
Discovery Science: The Earth – Origins The stages of the Earth’s development can be derived from hypotheses based on both good evidence and speculation about the origins of the solar system. However, one thing is certain: it was a long journey from a glowing ball to the blue planet, and at the beginning there was … Read more
