Which war was it when germany invaded poland

WW2

Explanation:

German troops invaded Poland on September 1, 1939, triggering World War II. In response to German aggression, Great Britain and France declared war on Nazi Germany

answer; /// the answer to the first question is (b) it began when people first deliberately seeds; /// and (d); // it gave people a steady food supple for the first time;

answer; i believe the correct answer is (a) the correlation between the cause variable and outcome variable is zero;