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With the 200th anniversary of the birth of Charles Darwin this workweek , mass around the world are lionize his role as the sire of evolutionary theory . Events and crush release are pitch , in part , to combat false claims made by some who would discredit the hypothesis .

One frequently cited " hole " in the hypothesis : Creationists lay claim there are no transitional dodo , aka missing links . Biologists and fossilist , among others , know this title is false .

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Nichollsia borealis on display at the Royal Tyrrell Museum in Drumheller, Alberta. This plesiosaur swam in the Cretaceous seas over what is now part of North America.

As key grounds for organic evolution and species ' gradual change over clip , transitional animal should resemble intermediate species , having skeletal and other body features in common with two distinct groups of animals , such as reptiles and mammals , or fish and amphibians .

These animals vocalize groundless , but the fossil record — which is far from complete — is full of them nonetheless , as document by Occidental College geologist Donald Prothero in his book " Evolution : What the Fossils Say and Why It Matters " ( Columbia University Press , 2007 ) . Prothero discussed those fogy last month at the American Museum of Natural History in New York , along with transitional fossils that were foretell since the leger was published , including the " fishibian " and the " frogamander . "

At least hundred , maybe thou , of transitional fogey have been found so far by research worker . The exact count is unclear because some lineages of organism are endlessly evolving .

The fossil Keurbos susanae - or Sue - in the rock.

Here is a unforesightful list of transitional fossil documented by Prothero and that add to the mountain of evidence for Charles Darwin ’s hypothesis . A lot of us concern most to fossils of life history closely connect to humans , so the tilt focuses on mammal and other vertebrate , including dinosaurs .

mammal , including us

Dinosaurs and birds

a researcher compares fossil footprints to a modern iguana foot

Fish , frogs , turtles

A photograph of a newly discovered Homo erectus skull fragment in a gloved hand.

Artist illustration of the newfound dinosaur species Duonychus tsogtbaatari with two long sickle-shaped claws pulling a tree branch towards its mouth.

A view of many bones laid out on a table and labeled

Here we see a reconstruction of our human relative Homo naledi, which has a wider nose and larger brow than humans.

This ichthyosaur would have been some 33 feet (10 meters) long when it lived about 180 million years ago.

Here, one of the Denisovan bones found in Denisova Cave in Siberia.

Reconstruction of the Jehol Biota and the well-preserved specimen of Caudipteryx.

Fossilized trilobites in a queue.

A reconstruction of Mollisonia plenovenatrix shows the animal�s prominent eyes, six legs and weird butt shield

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An image comparing the relative sizes of our solar system�s known dwarf planets, including the newly discovered 2017 OF201

a view of a tomb with scaffolding on it

an illustration showing a large disk of material around a star

A small phallic stalagmite is encircled by a 500-year-old bracelet carved from shell with Maya-like imagery

a person holds a GLP-1 injector

A man with light skin and dark hair and beard leans back in a wooden boat, rowing with oars into the sea