Why are salmon and shrimp considered the biggest problems in aquaculture?

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).

The third stage of cellular respiration is (2 points)

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?