When living organisms first appeared on Earth,how many cells did they have? square unicellular multicellular Rewatch

The question is asking about the number of cells that the first living organisms on Earth had. The options provided are "unicellular" and "multicellular". Unicellular organisms are made up of a single cell, while multicellular organisms are made up of multiple cells. The first living organisms on Earth were simple and were unicellular. These organisms were single-celled and were able to carry out all the necessary functions of life within one cell. Over time, as life evolved, more complex multicellular organisms emerged. Therefore, the correct answer is "unicellular".