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2 votes
Which organ develops and is fully functional in the first trimester

1 heart
2 brain
3liver
4lungs

2 Answers

6 votes

The neural tube (which becomes the brain and spinal cord), the digestive system, and the heart and circulatory system begin to form.

User Pkumarn
by
6.3k points
3 votes
I believe it’s the heart
User Javier Luraschi
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6.2k points