If your asking about like concept webs that branch from a bigger picture to smaller concepts, I actually use PowerPoint for this. They have a smart art feature and you can make all sorts of webs and flowcharts. Hope that helps!
Answer:
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DNA in all humans are composed of the same stuff just not the same genes (basically) . Organisms like sea animals for example wouldn't have the same DNA with us because they havebto survive in a different environment and have to have special obillities