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What are Species?

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The tree of life is huge but is seems like every animal has it’s designated spot. How do scientists draw the lines between species?

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Read More:
Rock-wallaby interbreeding causes rethink on evolution
http://phys.org/news/2015-10-rock-wallaby-interbreeding-rethink-evolution.html
“It was previously thought that mating between different rock-wallaby species could not result in fertile offspring. This is because of the differences in the way their genetic material is packaged into chromosomes.”

Humans Related to Orangutans, Not Chimps, Says New Pitt, Buffalo Museum of Science Study of Human Origin
http://www.news.pitt.edu/news/humans-related-to-orangutans
“Researchers propose new grouping for humans, orangutans, and common ancestors and lay out a scenario of the migration and evolution of 'dental hominoids' in the ‘Journal of Biogeography.’”
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