Which of the following fish belongs to gnathostomata?

Match the animals of Column $\mathrm{I}$ with their respective classes in Column $\mathrm{II}$ and choose the correct answer.

Select the code for the correct answer from the options given below.

Give scientific reasons. All vertebrates are chordates but all chordates are not vertebrates.

Go through the following flow chart for the division of subphylum Vertebrata. Fill in the gaps A, B, C, and D and select the correct option.

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

Refer to the given figures A -D and select the incorrect statement regarding them.