In the great famine of the 1840s, about two million irish were pushed from ireland and pulled to the united states by

climate

religion

jobs

culture

The crop failures were caused by late blight, a disease that destroys both the leaves and the edible roots, or tubers, of the potato plant. The causative agent of late blight is the water mold Phytophthora infestans. The Irish famine was the worst to occur in Europe in the 19th century.

your answer is b hope that

answer; the correct answer to the above statement is (biosphere); ///