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the two most commonly held ideas about the origin of species
A '''species''' is a group of living beings or organisms having common ancestry and therefore significant genetic similarities in common. The boundary between one species and another is the ability to mate and produce offspring. <ref>A group of organisms belong to the same biological species if they are capable of interbreeding to produce fertile offspring. [http://www.biochem.northwestern.edu/holmgren/Glossary/Definitions/Def-S/species.html Holgrem Lab], Northwestern University, Illinois </ref>
A '''species''' is a group of living beings or organisms having common ancestry and therefore significant genetic similarities in common. The boundary between one species and another is the ability to mate and produce offspring. <ref>A group of organisms belong to the same biological species if they are capable of interbreeding to produce fertile offspring. [http://www.biochem.northwestern.edu/holmgren/Glossary/Definitions/Def-S/species.html Holgrem Lab], Northwestern University, Illinois </ref>
A tiger and a clam are different species, because they cannot mate. A German Shepard and a Beagle can mate, because they are different breeds within one species.
A tiger and a clam are different species, because they cannot mate. A German Shepard and a Beagle can mate, because they are different breeds within one species.
==The origin of species==
Most Americans believe that God created the different species of plants and animals in six days of Creation (Genesis chapter 1). Religious faith on this is divided into [[Young Earth Creationism]] (the process started less than 10,000 years ago and took a short time) and [[Old Earth Creationism]] (the process began hundreds of millions of years ago and took millions of years).
==Note==
==Note==