sibling species

sibling species

noun Biology.
one of two or more species that closely resemble one another but whose members cannot interbreed successfully.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Sibling species is always a great word to know.
So is life cycle. Does it mean:
the continuous sequence of changes undergone by an organism from one primary form, as a gamete, to the development of the same form again
a microscopic structure containing nuclear and cytoplasmic material enclosed by a semipermeable membrane, the basic structural unit of all organisms
American Heritage
Science Dictionary
sibling species   (sĭb'lĭng)  Pronunciation Key 
Any of two or more related species that are morphologically nearly identical but are incapable of producing fertile hybrids. Sibling species can only be identified by genetic, biochemical, behavioral, or ecological factors, and are thought to have become divergent very recently.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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