Question

Why do we say that there is no natural death in single-celled organisms?

Answer 1

1: Unicellular organisms
Single-celled organisms (unicellular) are those organisms that contain only one cell to perform all of its functions. For example, prokaryotes (bacteria) and eukaryotes (protists, unicellular fungi and algae).

2: Reproduction and immortality
The single celled organisms reproduce asexually by dividing itself into two new daughter cells. This way the genetic material and cellular contents of the parent cell get distributed among two daughter cells. This makes the parent cell survive without natural death in subsequent generations.