In 1859, Charles Darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. He defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".
Potential unemployment because that would mean there would be people not getting money + not sErving their part in the community
needs is the regulation of temperature, water levels and pH balance
Answer:
no who say this no harmful for humans
Change in color, smells, or bubbles forming, heat