Question

define unicellular organism and multicellular organisms​

Answer 1

Answer:

Unicellular Organism : These are those Organism which are formed by a single cell and hence called unicellular Organism.

for eg. Amoeba

Multicellular Organisms:These are those Organisms which are formed by many cells or billions of cells are called Multicellular Organisms.

For eg. Human beings

I hope it's helps you

Answer 2

organisms with only one cell (I. e. they themselves are cells) are called unicellular organisms.eg- amoeba, paramecium and chlamydomonas.

organisms containing many cells are called multicellular organisms. eg: mammals, birds.

hope it helps! ❤❤