Conversation so far:
how many cells are in a multicellular organism
Multicellular organisms are organisms that consist of more than one cell.
what lifeforms do multicellular organisms make up
All species of animals, land plants and most fungi are multicellular, as are many algae.
how do multicellular organisms form
Multicellular organisms arise in various ways, for example by cell division or by aggregation of many single cells.

Question: what advantages do the organisms have
Self-contained rewrite: what advantages do multicellular organisms have