Transitional fossil is:
> is in the middle of a direct lineage stretching from ancient forms to organisms today.
Any fossilized remains of a life form that exhibits traits common to ancestral group and its derived descendant group is termed transitional fossil
The fossil record show many examples of transitional features. They provide an evidence for evolutionary change over time.
Five fossils from the time of the transition are the osteolepiform Eusthenopteron; the transitional forms Panderichthys and Tiktaalik; and the primitive tetrapods Acanthostega and Ichthyostega.
Fossils can be formed different ways but mostly they are formed when a living organism dies and is quickly buried by sediment. After formation of fossils, they might be washed away by streams, moved by glaciers or carried by scavengers. Weathering by wind, water, and sun can also lead to destruction of a fossil by wearing it away.
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