Help me please:) in order if you can☺️

What is one early technological advance that shaped culture? a the use of fire b the discovery of arable land c family units. d migration

According to speculation and study, what will happen to the global birth rate in about 40 years? (1 point)

With these question would be nice i needs them in a hurry which nation leads eastern europe in nuclear energy usage? a ukraine b lithuania c slovakia d solvenia which eastern european nation is popular with skiers? a czech republic b estonia c bulgaria d none are