19th century biology

Why did Darwin wait so long to publish On the Origin of Species?

Respond to the Forum question(s) of the week in a main post that is at minimum 250 words and at maximum 500 words. Students should not provide just a summary of the readings in responding to the question, but support an interpretation or argument. However, this is not a mere opinion piece; you must use the reading assignments and outside research (all resources must be cited in proper format). Each response MUST include citations to the textbook and to the readings from the APUS library. Use these sources to assist you in answering the question you select for the week.