dead cells
No cells are unicellular, only organisms can be unicellular.
Prokaryotes
a microscopic code in the cells that tells the cells what kind of organism to develop into.
Yes, starfish are eukaryotic organisms.
Depends on which cell type your talking about, as cells can do many things depending on what kind of cell they are.
Any kind of plant that can produce glucose and oxygen in photosynthesis.
Multicellular organisms whose cells have nuclei but don't have cell walls are called anamalia cells
If it is alive then it is an oganism. You just need to know if it's alive. Anythin' that is living is an organism. depends on the cell and the level of organization: bacterial cells are considered organisms liver cells are not organisms read up on cell theory (not the marxist kind) that should clarify the definition of organisms for you.
differentiation
Any kind of Prokaryote, including bacteria and archaea.
single celled organisms
if you mean plants, animals and fungi then eukaryotic cells. plant shape - square or rectangle animal shape - circle