What is the most probable ancestor of pyrrophytes, chrysophytes and phaeophytes? Why?

Question

What is the probable ancestor of the 3 algal divisions (Division Pyrrophyta, Division Chrysophyta and Division Pheophyta)? Why?

Answer 1

I read an article that pyrrophytes, chrysophytes and phaeophytes have no certain ancestors.

You are asking why?

How to answer this question if there is no such certain evidence!

But you can read some interesting things about them in the link giben beneath.

READ the second article about plant phylogeny.

http://www.bcas.net/Env.Features/Biodive...

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Suggest reading some more articles about these species

http://en.wikibooks.org/wiki/General_Bio...