Which statement about human cellular organization is true?

Which statement about human cellular organization is true?

• A. Humans are unicellular
• B. Humans are multicellular
• C. Humans have no cells
• D. Humans can be either unicellular or multicellular depending on age

Answer: (B)

Humans are multicellular organisms made up of many specialized cells that work together to keep the body functioning. After fertilization, a single cell divides and differentiates into a variety of cell types—nerve cells, muscle cells, blood cells, and more. These cells organize into tissues, tissues form organs, and organs coordinate in organ systems to carry out all necessary life processes. This cooperative arrangement is what defines multicellularity in humans. The other options don’t fit because humans do have cells, they are not a single cell, and while development begins with one cell, the organism remains multicellular throughout life.

Humans are multicellular organisms made up of many specialized cells that work together to keep the body functioning. After fertilization, a single cell divides and differentiates into a variety of cell types—nerve cells, muscle cells, blood cells, and more. These cells organize into tissues, tissues form organs, and organs coordinate in organ systems to carry out all necessary life processes. This cooperative arrangement is what defines multicellularity in humans. The other options don’t fit because humans do have cells, they are not a single cell, and while development begins with one cell, the organism remains multicellular throughout life.