One hypothesis that proposes to explain senescence notes that cells that divide throughout the life course have shortened dna sequences at the end of the chromosomes. this is referred to as the hypothesis. hadromere carsonomere telomere intron none of these

telomere hypothesis

Explanation:

Telomere hypothesis -

Telomere -

It is the area where there are repetitive nucleotide sequence at the very end of the chromosome that does not allow the ends from fusing with the other chromosomes and even from deteriorating .

according to the hypothesis , the cells have shorter DNA sequence which divide throughout the life .

hence , the correct term for the given statement is - telomere hypothesis  .

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.