Geographers use two key questions every day, When using these two key questions to study the migration of birds, a geographer would ask "Where are the birds going?' and"
А. what season is il
В. which birds are migrating
C when are the birds traveling
D. why are they going there

D why are they going there because they need to know

The answer is a for sure

Conditions are more like living on  land  for creatures in the upper part of the intertidal, which is only covered with  water  at extreme high tide, so life is easier on land. conditions are more like living in the ocean for creatures in the lower part of the intertidal which is only exposed to air at extreme low tide. so basically it both worlds of land and ocean.