vestigial
refers to an organ or part (for example, the human appendix) which is greatly reduced from the original ancestral form and is no longer functional or is of reduced or altered function.
Vestigial structures provide a clue to the evolutionary history of a species because they are remnants of structures found in the ancestral species.
Meet the colorful takahē, an extremely rare flightless bird. Find out more about its unique features and why they matte..
Neurons generate electric signals that they pass along to the other neurons or target tissues. In this tutorial, you wil..
Following nine months inside the mother's womb is the birth of the baby. Know the different stages of the birthing proce..
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The kidneys are responsible for the regulation of water and inorganic ions. Read this tutorial to learn about the differ..