Afarmer who has grown corn for the past five years notices in the sixth year that his harvest is significantly smaller although the labor he has put into farming has increased. the following year the harvest continues its decline. which of the following explanations most plausibly accounts for the reduction in corn yield?
soil degradation
desalinization
better irrigation
terracing

The great scientist alfred wegener proposed that continents have moved, while other scientists such as t.c.chamberlin argued against wegener. wegener's ideas eventually won, and are now widely accepted, because: a) wegener's ideas were more beautiful, and so were favored by the intellectual elite.b) wegener's ideas did a better job of predicting the results of new observations and experiments.c) wegener's ideas appealed to dead white european males, whereas chamberlin's didn't.d) wegener's ideas appalled dead white european males, and we all know that in this politically correct era,dead white european males cannot get a fair shake.e) wegener won the nobel prize.