Describe an individual with the karyotype shown

D

Explanation:

It's because in number 23 there is only one homologous chromosome present which indicates the female has Turner's syndrome.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.