Identify from the following the only category that has a real existence

Identify from the following the only taxonomic category that has a real existence.

Identify from the following the only taxonomic category that has a real existence.

Identify from the following, the only taxonomic category that has a real existence –

Identify from the following, the taxonomic category that is on second highest rank.

Which one has a real existence

Which one has a real existence?

Which one has a real existence?

Identify the quantifier of the following statement : There exists a real number x such that sqrt x is a natural number.

(b)Identify the quantifier in the following statement:There exists a real number which is twice of itself.