Which of the following was a substantial obstacle(s) in Darwin's thinking that prevented him from further developing his theory?

Question

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Darwin struggled with understanding how organisms within a population differed from one another (option A) and how traits could be transmitted from one generation to another (option B). These were substantial obstacles in his thinking and led to his development of the theory of natural selection to explain how species change over time. The question of which organism was the first original organism (option C) was not a significant obstacle in Darwin's thinking or in the development of his theory of evolution.

Which of the Following Was a Substantial Obstacle(s) in Darwin's