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The kids finally get into Starfleet Academy, only to have the attack on Mars [f] drastically change things. Returning to Starfleet in the wake of the attack, Janeway has the new Protostar-class vessel, the USS Prodigy, turned into a training ship and gives it to the former Protostar crew along with field commissions to the rank of ensign.
The evolution of tetrapods began about 400 million years ago in the Devonian Period with the earliest tetrapods evolved from lobe-finned fishes. [1] Tetrapods (under the apomorphy-based definition used on this page) are categorized as animals in the biological superclass Tetrapoda, which includes all living and extinct amphibians, reptiles, birds, and mammals.
Eusthenopteron differs significantly from some later Carboniferous tetrapods in the apparent absence of a recognized larval stage and a definitive metamorphosis. [6] In even the smallest known specimen of Eusthenopteron foordi , with a length of 29 millimetres (1.1 in), the lepidotrichia cover all of the fins, which does not happen until after ...
The tongue is anchored to the hyoid bone, which was once the lower half of a pair of gill bars (the second pair after the ones that evolved into jaws). [89] [90] [91] The tongue did not evolve until the gills began to disappear. Acanthostega still had gills, so this would have been a later development. In an aquatically feeding animals, the ...
New animals appeared in the warmer, drier regions near the equator as four-legged vertebrates called stem tetrapods evolved and split into groups that formed the basis for modern animals.
Devonian (419–359 mya): The start of Devonian saw the first appearance of lobe-finned fish, precursors to the tetrapods (animals with four limbs). Major groups of fish evolved during this period, often referred to as the age of fish. [39] See Category:Devonian fish. D e v o n i a n: Early Devonian: Early Devonian (419–393 Ma): Psarolepis
The creature existed some 40 million years before dinosaurs evolved. Researchers have long examined such ancient predators to uncover the origins of tetrapods: four-legged animals that clambered ...
That fish and its friends eventually evolved into a plethora of species that belong to a group collectively known as tetrapods, which encompasses all four-limbed vertebrate creatures that roam the ...