The correct option is D.
Scientific knowledge is very dynamic, it changes all the time based on emergence of new evidence. When new evidence are discovered, the scientific knowledge that are already in use are usually modified based on the new discovery.<span />
The answer is ureter. They concentrate the urea from nephrons and collect in the bladder. They are larger in diameter (<span>25–30 cm) compared to the proximal and distal tubules, loop of henle and collecting tubules. There is one ureter for each kidney connecting to the bladder. The ureter has smooth muscles that cotract and direct the urine to the bladder
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Choice A:
A male inherits only one of the two X-linked genes controlling hair color.
If a cell did not replicate its DNA (during the S-phase) before beginning mitosis, then the two identical daughter cells would only get one chromosome from each pair. This, instead of the normal (diploid) 2 pairs of each chromosome (2×23=46), would lead to two haploid cells with 23 total chromosomes each. They would be unable to function and sustain life, thus would likely die soon after division.