<span>it occurs during meiosis and increases the chances of genetic variation in organisms</span>
Regeneration in planarians depends on the presence of stem cells called neoblasts. These cells are distributed throughout the body and, when part of the worm has been amputated, they are activated to reform the tissues that have been removed.
The fertilizer is the independent variable because the independent variable is what changes
The answer would be A. Rock Formation because after the crust is cooling it starts to form a new rock formation, which would be the next step in the project. Hope this helped! :D