Question

This starfish had lost two of its arms. By what process could it regenerate them?

Answer 1

mitosis

Step-by-step explanation:

The first dude is wring got me wrong on my first take :p

Answer 2

Starfish, actually not being fish but instead marine invertebrates, can amputate its own arms and reproduce is self asexually. The central discs are split into fragments through a process that is called fission, and which the regeneration process happens and genetically identical limbs are thereby reproduced.