Which of the following is $NOT$ a characteristic of the phylum $Annelida$?

Which of the following oxides is different from the other three oxides?

If the curves $x^2 - 6x + y^2 + 8 = 0$ and $x^2 - 8y + y^2 + 16 - k = 0$ $(k > 0)$ touch each other at a point,then the largest value of $k$ is

Charges are placed on the vertices of a square as shown. Let $\overrightarrow{E}$ be the electric field and $V$ be the electric potential at the centre. If the charges on $A$ and $B$ are interchanged with those on $D$ and $C$ respectively,then:

The number of four-letter words that can be formed using the letters of the word $BARRACK$ is:

Teak wood is obtained from which plant?