In which of the following plants is the main plant body a gametophyte?

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.

Some species of $Sphagnum$ provide....

In which of the following is the gametophytic phase dominant?

In which group is the gametophytic plant body thalloid or erect?

Bryophytes are not tall because they-