How do Phaeophyta (brown algae) move? Or do they move?

Question

I can't find it anywhere when I search it on google

Answer 1

The brown algae get spread around by forming spores that get carried by currents and waves.  Brown algae have alternation of generations in which the sporophyte stage (the seaweed we typically see in the water or washed ashore) has two sets of chromosomes per cell.  It undergoes meiosis to form spores that have one set of chromosomes.  The spores eventually germinate and form a gametophytes which is small and inconspicuous.  It is so different from the sporophyte that it was described and given a different scientific name from the sporophytes!  The gametophytes form s*x cells and reproduce sexually forming the new sporophyte stage.