It will soon be autumn, and the birds seem to be preparing for
a. migration
b. inevitable
c. regenerate
d. crisscrossing

A. Migration (birds migraye to warmer climates during colder months)

integrated circuit (ic) is defined as a set of electronic circuits on one small flat piece of semiconductor material, normally silicon. a functional electronic circuit requires transistors, resistors, capacitors, inductors, etc., and the connections between them.

i'd have to say the answer is probable the second option "the geosphere interacting with the atmosphere"