Question

cells are the building blocks of life! an organism made of one cell is a unicellular organism. an organism made of 2 or more cells is a(n) ______________ organism.

• big
• unicellular
• organ system
• multicellular

Explanation:

The question is about cell - based classification of organisms in biology. A unicellular organism has one cell. By definition, an organism with two or more cells is called a multicellular organism. The option "big" is not a scientific term for this classification. "Unicellular" is for single - celled organisms, and "organ system" is a level of biological organization within a multicellular organism, not the term for the organism itself.

Answer:

D. multicellular