Halp ^_^ this is too hard for and im being sacked more assignments

Random mutations in DNA cause variation of snails. Brown snails blend in and aren't seen. They reproduce and pass on the trait that is advantageous for each beach environment.

C.Random mutations in DNA cause variation of snails. Brown snails blend in and aren't seen. They reproduce and pass on the trait that is advantageous for each beach environment.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.