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:

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

i'm sorry, but can you list the answers? i cannot with something i don't know the answers to

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chris