What major problem existed in evolution theories for all scientists to mention, even Darwin? Which scientist started to clear up this problem?

Growing up a shy and unassuming member of a wealthy British family, ... the basic outline of his groundbreaking theory of evolution through natural selection. ... of a backlash from Britain's religious and even scientific establishment ... to be in clear opposition to the idea that all creatures had been created

Explanation:

cramming before a final is bad because it makes a student's stress level higher. students who embrace cramming to get through a final exam week find themselves struggling to perform consistently, once the brain adjusts to prolonged sleep deprivation.