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[3] Similarly, laurasiathere perissodactyls and afrothere paenungulates have several features in common, to the point of there being no obvious distinction among basal taxa of both groups. [4] Many aquatic mammals or marine mammals independently came to have adaptations to live in water, such as similar-looking tail flukes in dugongs and whales.
Grasslands and savannas are established, diversity in insects, especially ants and termites, horses increase in body size and develop high-crowned teeth, major diversification in grassland mammals and snakes. 9.5 Ma [dubious – discuss] Great American Interchange, where various land and freshwater faunas migrated between North and South America.
While reptiles and amphibians can be quite similar externally, the French zoologist Pierre André Latreille recognized the large physiological differences at the beginning of the 19th century and split the herptiles into two classes, giving the four familiar classes of tetrapods: amphibians, reptiles, birds and mammals. [30]
Today's Connections Game Answers for Monday, September 11, 2023: 1. TV SHOWS: 24, BONES, FIREFLY, WEEDS 2. HALLOWEEN DECORATIONS: BAT, COBWEB, PUMPKIN, TOMBSTONE 3 ...
It refers to the tailless character of these amphibians. [8] [9] [10] The origins of the word frog are uncertain and debated. [11] The word is first attested in Old English as frogga, but the usual Old English word for the frog was frosc (with variants such as frox and forsc), and it is agreed that the word frog is somehow related to this.
The first amphibians appeared on land in the Carboniferous. During the Triassic , mammals and dinosaurs appeared, the latter giving rise to birds in the Jurassic . Extant species are roughly equally divided between fishes of all kinds, and tetrapods.
Comparative anatomy is the study of similarities and differences in the anatomy of different species. It is closely related to evolutionary biology and phylogeny [ 1 ] (the evolution of species). The science began in the classical era , continuing in the early modern period with work by Pierre Belon who noted the similarities of the skeletons ...
Evolutionary theory predicted that since amphibians evolved from fish, an intermediate form should be found in rock dated between 365 and 385 million years ago. Such an intermediate form should have many fish-like characteristics, conserved from 385 million years ago or more, but also have many amphibian characteristics as well.