Answer:
A mutation.
Explanation: When a cell mutates is will be permanently changed.
Answer:
The end of the metaphase and beginning of anaphase is marked by the splitting of centromere so that two chromatids (In fact complete chromosomes) start moving to the opposite pole during anaphase. Thus the chromosomes divide at anaphase by the splitting of centromere.
so it's Pulled apart at the centromere (5th)
Spindle Fibres are those structures which move chromosomes only during cell division.
And these spindle fibres are formed by the command of centrioles which during the process move to the on the opposite poles and helps the cell to prepare for division.
When you cut down a tree, there are rings on the inside of the tree. You can count these lines to help determine how old the tree is.
