Which of the following is a multicellular organism? insect human flower all of the above

All of the above.

A multicellular organisms is any living this that is made up of more than one cell. Insects, humans and flowers are all made up of microscopic cells that each serve it's own purpose in supporting life.

An example of a single celled organism would be bacteria. They are a very basic living thing only made up of a single cell.

Hope this helps!

They became more resistant.