Please help me out!! This is AP BIO Scientific Method Researchers noticed that the number of earthworms increased from the Spring of 2017 to the Spring of 2018, a time period where their crops flourished. They hypothesize that Earthworms are necessary for healthy crops.
a. Describe an experiment that could test their claim. You must include the independent variable, dependent variable, control and constants. (A diagram may be helpful)

Answer(a) cheap enough for small shops to purchase;

1. unlikely2. unlikely

Like many students at university, you may be unhappy about the results you attain in exams. you may feel that even with all you are doing there must be something more -- or different-- you could be doing to get better grades. we have all at some time or other heard of that student who only studies a couple of hours for final exams and scores a's every time. we stand in awe of those who seem to breeze through without undue effort and seem to need very little in the way of studying to nail an exam. the reasons for success, in what i think are the vast majority of cases, are less esoteric than many students think: successful students consistently apply a series of productive strategies with view to attaining clearly identified learning and grade goals throughout the academic term.

The marshall plan rebuilt europe after ww2