Biology 1225 Chapter Notes - Chapter 13: Endoplasmic Reticulum, Cytoskeleton, Meiosis
23 Sep 2013
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Chapter 13 early life forms and the viruses. Life originated on earth more than 3. 8 billion years ago. Its origin and subsequent evolution have been linked to the physical and chemical evolution of the universe, the stars and our solar system. In the past century, many studies and experiments have provided indirect evidence that life originated under conditions that presumable existed on the early earth. In comparison to the age of the earth, humans (homo sapiens) have been around for only a very short period of time. Humans are a recent offshoot of the primate group. Human evolution has been marked by trends that involved changes in our bones, muscles, teeth, sensory systems and the brain. Taxonomy the science of the naming and categorization of organisms according to their evolutionary similarities. Naturalists and biologists have documented more than 1. 4 million species that exist on the earth today, and perhaps millions more wait to be discovered and classifies.
