Ttc Biology: The Science of Life

About 100,000 to 60,000 years ago, a species of hominines—bipedal ape-like creatures—began to move out of its home territory in Africa and into the Asian continent. Today, homo sapiens, the descendants of those first hominines—live in nearly every ecological niche. We fly through the air in planes, communicate instantaneously over immense distances, and develop theories about the creation of the Universe.

Life is stranger than fiction. Recent investigations hint at episodes in the history of life on Earth that rival the most imaginative movies. For example: Could our planet have been seeded with life from elsewhere? Did the development of life create conditions that threatened to poison the biosphere? How have natural forces conspired, over and over, to remove most traces of life from the planet? And how has life itself responded with determination to survive and thrive in a multitude of astonishing forms?