How to calculate how many times a cell would have to split to form 100 trillion cells?

Which flexible structure that supports the nerve cord and led to the backbone

Why is the theory of evolution important? it disproves all other theories about how life began. it provides a topic for debate. it is a unifying concept in biology. it explains how life began. i know for sure, it is not "it is a unifying concept in biology."

I’m stuck on this question cuz i’m stupid sksksksk