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There are two answers to this simple but complex answer, but the answer is fugi and animilia. They are both multicellular and heterotrophic.
the answer is ciliates
Archeabacteria are the most simple celled organisms. they can thrive in hazardous regions because they are so simple. being simple allows them to live in such harsh regions like high salt concentrations, high heat and high pressured areas. they are the simplest form of prokaryotes (bacteria are also prokaryotes).
The Protista Kingdom contains the most complex species as there is no such thing as a "typical" protist, it is filled with the "misfits" that cannot be categorized in any other kingdom.
cell, organ,organ system,tissue
That depends on which organism. Generally, an organism is more complicated than an organ, but if the organism is unicellular (has one cell) then it could be more simple. Since one celled organisms don't have individual organs, then the anwer is that organisms are more complicated than organs.
There are two answers to this simple but complex answer, but the answer is fugi and animilia. They are both multicellular and heterotrophic.
Humans are not the most complex organisms. Water fleas are the most complex organisms, containing 31,000 genes, about 25% more than the average human. Their body has enough genes to transform itself based on the environment it's in.
the answer is ciliates
complex multicellular organisms
It was possibly the most complex military operation ever.
cell wall fungi
jellyfish
Animalia-- animals
Archeabacteria are the most simple celled organisms. they can thrive in hazardous regions because they are so simple. being simple allows them to live in such harsh regions like high salt concentrations, high heat and high pressured areas. they are the simplest form of prokaryotes (bacteria are also prokaryotes).
bacteria
cells to tissues to organs to organ systems to organisms... cells to tissues to organs to organ systems to organisms...