State whether the given set is finite or infinite: The set of animals living on Earth.

State whether the given set is finite or infinite: The set of consonants in the English alphabet.

State whether the given set is finite or infinite: The set of circles drawn in a plane.

State whether the given set is finite or infinite: The set of prime numbers which are less than one crore.

Find the cardinal number of the sets: $\left\{0\right\}$.

Find the cardinal number of the sets: $A=\left\{1,2,2,1,3\right\}$.

Find the cardinal number of the set: The set of all Indians having $8$ legs.

Find the cardinal number of the set: The set of all letters in the word $\mathrm{PRINCIPAL}$.

Find the cardinal number of the set: The set of all vowels in the word $\mathrm{PRINCIPAL}$.