What is the reproductive age for glass sponges? (hexactinellida)and are they prokaryote or eukaryote?

Question

any answer to either question is fine.

Answer 1

Poriferans (sponges) are in the Kingdom Animalia, so they are eukaryotes. For example, see:

http://en.wikipedia.org/wiki/Glass_spong...

I don't know how old they are on average when they become sexually mature, but according to the AnAge database, they have been estimated to be able to live for thousands of years. See:

http://genomics.senescence.info/species/...

There is one article that I could find that might be related to what you're looking for, but I've only scanned its abstract so far. It's in Integrative & Comparative Biology, a respected & peer-reviewed journal in this field; see:

http://icb.oxfordjournals.org/cgi/conten...

It looks like you can download a PDF of the article (look in the sidebar on the right).

Hope that helps!