With survival of the fittest, every day is a chal'
from Nas (Ft. Amerie) – Rule Lyrics on Rap Genius
Meaning
“Survival of the fittest” is a phrase initially coined by British philosopher Herbert Spencer in 1864, creating a metaphor for those who are “better adapted for immediate, local environment”.
This phrase was later used by the hip-hop duo Mobb Deep in a widely known song “Survival of the Fittest”. They primarily focused on how it’s every man for himself in the streets… and if you don’t have any power or juice, no one will care; you’ll probably end up dead.

Nas was featured in the music video of the song (near the end).
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