Question

what information would a scientist most likely use to determine whether an organism is unicellular or multicellular?
the rate at which the organism grows
the size of the cells of the organism
the types of cells in the organism
the types of food the organism eats

Explanation:

Unicellular organisms have one cell while multicellular have many. The key is cell - type variety. If an organism has different types of cells specialized for different functions, it is multicellular. If only one type, it may be unicellular. Growth rate, cell size, and food - type are not determining factors for cellularity.

Answer:

The types of cells in the organism