Question

how do strs contribute to each persons uniqueness?
○ strs are not unique, because the coding regions of dna contribute to each persons uniqueness.
○ they contain a different nucleotide pattern for each person.
○ the exact number of repeated noncoding regions vary from person to person.
○ they show up in different places in each persons chromosomes.

Explanation:

STRs (Short Tandem Repeats) are noncoding DNA sequences with repeated nucleotide motifs. Their uniqueness comes from the variable number of repeats at specific loci, which differs between individuals. This variation is the basis for DNA profiling and contributes to individual uniqueness.

Answer:

The exact number of repeated noncoding regions vary from person to person.