The first bursts of life found in the fossil record were
single-celled bacteria and algae, the foundation of life that led
to the extraordinary cavalcade of organisms that have walked the
stage of Earth ever since. From the initial signs of life in the
Precambrian Period to the end of the Cambrian Period about 488
million years ago, ""Early Life"" explores the development of early
life that culminated in one of the most extraordinary periods in
the evolution of life on Earth. Characterized as a ""biological big
bang,"" the Cambrian Period was a relatively short span of time
during which nearly all basic forms of animal life that still exist
first appear in the fossil record of the ancient oceans.
Alien-looking marine creatures developed in the oceans, and the
first predators began hunting down other species in a biological
""arms race"" that pitted elegant strategies for defense against
increasingly efficient means of attack.
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