Explain one similarity and one dissimilarity between nuclear fission and fusion.

Explanation

### Step-by-Step Solution

**Step 1: Define Nuclear Fission and Fusion**
- **Nuclear Fission**: This is the process where a heavy nucleus splits into two or more lighter nuclei, along with the release of energy. It typically involves elements like Uranium-235 or Plutonium-239.
- **Nuclear Fusion**: This is the process where two or more light nuclei combine to form a heavier nucleus, also releasing energy. This process powers stars, including our sun, where hydrogen nuclei fuse to form helium.

**Step 2: Identify Similarity**
- Both nuclear fission and fusion involve a **mass defect**. This means that the total mass of the products (the resulting nuclei) is less than the mass of the original nuclei. This lost mass is converted into energy according to Einstein's mass-energy equivalence principle, \(E = \Delta mc^2\).
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