Fossils of Thrinaxodon, a species that lived during the Triassic period, have been found in both South Africa and Antarctica. Th
rinaxodon had a reptile-like skeleton and laid eggs, but small depressions on the front of its skull suggest it had whiskers and, therefore, fur. Thrinaxodon may have been warm-blooded. The fossils of Thrinaxodon are consistent with the hypothesis that _____.A) fossils found in a given area look like the modern species in that same area B) the environment where it lived was very warm
C) mammals evolved from a reptilian ancestor
D) Antarctica and South Africa separated after Thrinaxodon went extinct
Mammals, amphibians, and reptiles are tetrapods. Reptiles and mammals are shown to be originated from a common ancestor, the early tetrapods which in turn diversified into two lineages. One of the lineages evolved into synapsids and the other gave rise to reptiles and birds. Synapsids diversified into two lineages one of which later formed mammals.
According to the given information, fossil records of Thrinaxodon have a reptile-like skeleton and were oviparous like reptiles. However, the presence of furs and the possibility of being warm-blooded make it like a mammal.
Reptiles are cold-blooded egg-laying tetrapods while mammals are warm-blooded viviparous tetrapods. The presence of some of the features from both the groups in Thrinaxodon provides proof that mammals evolved from a reptilian ancestor.
The EPA is an independent agency formed for environmental protection. Hence the statement The Clean Air Act would be a reason for the Environmental Protection Agency (EPA) to regulate car emissions is true.
Car emissions are very harmful for all the living organisms in an environment.
In order to ascertain the total magnification when viewing an image with a compound light microscope, take the power of the objective lens which is at 4x, 10x or 40x and multiply it by the power of the eyepiece which is typically 10x.
