Question

Archaeopteryx is a connecting link between
A. Reptiles and birds
B. Reptiles and mammals
C. Fishes and reptiles
D. Chordates and non-chordates

Answer 1

Connecting link can be defined as an organism which has characteristics similar to that of two different groups.

Complete Answer:
Let us analyse the various options given to find the correct answer.
Option A: Archaeopteryx is a connecting link between reptiles and birds due to the following reasons,
- The is long and features free caudal vertebrae.
- The teeth are present within their jaws.
- Exhibits both weak and keelless sternum.
- Archaeopteryx shows the presence of feathers all over its body.
- It shows the presence of the modified forelimbs into wings.
- Four of its toes present in the foot are adapted for the purpose of perching.

Option B: Duck billed platypus is the connecting link between Reptiles and mammals and not Archaeopteryx. Therefore, this is the incorrect option.

Option C: There is no connecting link between fishes and reptiles. Therefore, this is the incorrect option.

Option D: Balanoglossus is the connecting link between Chordates and non-chordates and not Archaeopteryx. Therefore, this is the incorrect option.

Thus, the correct option is A) Reptiles and bird.

Note: The importance of connecting link is as follows,
- It gives a path for evolution.
- It helps in tracing back various organisms and finding their exact origin.
- They confirm the evolution of amphibians from fishes, arthropods to molluscs, etc.