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Sperm and egg nuclei fuse due to

1. base pairing of their DNA and RNA
2. formation of hydrogen bonds
3. mutual attraction
4. attraction of their protoplasts

Correct answer: mutual attraction

Solution

The fusion of sperm and egg nuclei is explained here by their mutual attraction, which allows the nuclei to come together and unite. The other choices describe specific molecular interactions or structures that do not account for nuclear fusion in this context.

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