Answers for the Quest  "Comparing Solana and Ethereum Transaction Processing Models" in Certik (https://skynet.certik.com/quest/comparing-solana-and-ethereum-transaction-processing-models?referralId=12079642374591486575)

1. What key feature distinguishes Solana's transaction processing model from Ethereum's?
- Use of Proof-of-History (PoH) and parallel processing

2. Ethereum’s transaction model is known for being:
- Sequential and limited by gas fees

3. Which vulnerability is more likely on Ethereum due to its sequential processing?
- Front-running attacks

4. What is one recommended best practice for mitigating security risks on these networks?
- Regularly auditing smart contracts and staying updated on network security improvements