Migration is a behavior that is usually influenced by
a. changing seasons.
b. the phase of the moon.
c. the rise and fall of tides.
d. the time of day.

Let's take as an example the behavior of some birds, for example Storks. They live in Northern Europe in the Summer but travel South during the winter. This behaviour is actually called a seasonal migration and is dependent on the change of seasons - so the correct answer is a)

i didn’t understand your question but archipelagos are groups of island hope this

Europe needs to build a trump-like wall that will spread across europe making it impossible for migrants to cross they need to spread pig guts all over this wall so the muslims will never consider crossing into europe..you might be asking "can't they just fly over with planes? " well yes they can so we will install thaad missile protections system to shoot down any aircraft that violates europe's air fourth would be to start a fourth reich in germany.. last but not least.. make europe great again!