Question

Connecting link between fish and amphibia is
A) Lungfish Protopterus
B) Latimeria
C) Seymouria and Sphenodon
D) All the above

Answer 1

Hint:Connecting link is generally defined as the link or a trait that is found in an organism but resembles the trait of two different organisms.

Complete answer
A connecting link is a link between two systematic classes of species. It is also called an intermediate or transitional state and represents an evolutionary line.

Let us analyze the options to find out the correct option.
Option A: Lungfish Protopterus is a connecting link between fishes and amphibians. It has the characteristics of both the fishes and amphibians in them. It is also considered as the missing link between fish and amphibians.Therefore, this is the incorrect option.

Option B: Latimeria is also a connecting link between fishes and amphibians as they also possess the characteristics of fishes and amphibians. However, they are now considered as a non living fossil. Therefore, this is the incorrect option.

Option C: Seymouria and Sphenodon are examples of connecting links between the amphibians and reptiles as they have the features of both reptiles and amphibians in them. Therefore, this is the incorrect option.

Option D: Since only one of the above mentioned options is correct this is the incorrect option.

Thus, the correct answer is option (A) Lungfish Protopterus.

Note:There are four species of lungfish found in Africa of which lungfish protopterus is a type. They are usually elongated with thread-like pectoral and pelvic fins.