<span>A mature sporophyte produces spores by meiosis, a process which reduces the number of chromosomes to half, from 2n to n. Because meiosis is a key step in the alternation of generations, it is likely that meiosis has a fundamental adaptive function. The nature of this function is still unresolved (see Meiosis), but the two main ideas are that meiosis is adaptive because it facilitates repair of DNA damages and/or that it generates genetic variation.
The haploid spores germinate and grow into a haploid gametophyte. At maturity, the gametophyte produces gametes by mitosis, which does not alter the number of chromosomes. Two gametes (originating from different organisms of the same species or from the same organism) fuse to produce a zygote, which develops into a diploid sporophyte.</span>
Answer:
Snow line
Explanation:
The lowest elevation at which layer of a permanent snow occurs in the summer is known as the snow line.
Snow line is defined as the boundary between a snow covered area and a snow free one.
The lowest level connotes with the level of snow during the summer because the temperature is warm at this period in time. Below this level, all the glaciers are frozen and will not melt in any way.
During winter, the snow line can rise due to drop in temperature.
Answer:
I'm really just guessing but, you should try (B)
