What can happen if the niche doesn't
function properly?

Stem cells can die or will differentiate/Cancer

Hope this helps

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;