150 words. Which one topic or concept was the most

150 words. Which one topic or concept was the most difficult for you from (The male or female reproductive system, the digestive system, or nutrition and metabolism)?  What specifically is “muddy” or not quite clear about that topic?  Please be as specific as possible in identifying the topic.   TITLE YOUR FORUM POST WITH THE TOPIC OF YOUR DISCUSSION.  After identifying the topic, try to elaborate on what you know thus far about it and/or ask specific questions(s) about it. 

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