Why are most finches which normally eat seeds unable to eat flower nectar like hummingbirds

1flowers in finches' environments do not produce nectar.
2most finches' beaks are too long and narrow to collect nectar.
3most finches' beaks are too short and broad to collect nectar.
4there are no flowers in finches' environments.

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.

the statement is true