Peristome teeth of moss show:

Which of the following is true for $Bryophytes$?

In bryophytes,reproduction occurs through which sex organs?

In this group,the gametophytic plant body is thalloid or erect.

Consider the following statements about bryophyte plants:
$I.$ The tea prepared from $Polytrichum$ $commune$ is used to dissolve kidney and gall bladder stones.
$II.$ Many chemical products such as alcohol,ammonium sulphate,paraffin,brown dye,etc.,can be obtained from peat.
Choose the correct option.

In moss,the medulla has: