Question

Which of the following is not an example of connecting links?
A.Archaeopteryx
B.Ichthyostega
C.Seymouria
D.Biston betularia

Answer 1

Hint:All new organisms which we see today are evolved from ancient organisms. It is unbelievable that the new groups of animals have all originated from the same ancient organisms because as we all know that they all differ from each other in many perspectives. But there are some living fossils with intermediate characters that interconnect these different groups of animals.

Complete step by step answer:Archaeopteryx- This is the genus of birds like dinosaurs which is a transition between non-avian (feathered dinosaurs) and modern birds. These characteristics make the Archaeopteryx a clear specimen for transitional fossils between the modern birds and the dinosaurs. These give an important role in studying the evolution of birds and studying dinosaurs.
Ichthyostega- It is an early genus of tetrapod morphs that lived at the end of the late Devonian period. It was one of the four-limbed vertebrates which are in the record of fossils. It had lungs and limbs which helped it to travel through shallow watered swamps.
Seymouria- It is an extinct genus of seymouriamorpha from the early Permian of Europe. They were amphibians but they were well adapted to land with many reptilian features. First, it was thought of like a reptile because of so many features of reptiles.
Biston betularia- It is the model of parallel evolution in the incidence of melanism in the British form of moth and the American moth they are indistinguishable in appearance. The genetic analysis says that both phenotypes are inherited as autosomal dominant.
Hence the correct answer is option D, Biston betularia.

Note:Archaeopteryx is considered the first bird. It is intermediate between the modern birds and the dinosaurs. The amphibian characters of Ichthyostega show Pisces characters. Hence, we can say that this was the connecting link between the Pisces and the reptiles. Seymour is the connecting link between reptiles and amphibians.