At the end of meiosis i, how many copies of dna is there?
1? 2? 4? 23

At the end of meiosis two copies of DNA are formed.

Explanation:

At the end of the meiosis two similar diploid daughter cells, in the end the haploid daughter cells by chromosomal combinations, which are dissimilar from the originally present in the parent. End of meiosis have two copies of each chromosome. In case of male, meiosis is spermatogenesis as sperm cells are formed. In females this process is called as oogenesis. The complete process of meiosis takes place in two stages, the main aim of meiosis is to divide the homologous chromosomes.

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.