Why will historians never truly know the physical appearance and customs of early humans?

Difference between joint tenancy and tenancy in common

Continue to drink or use other drugs and drive but be more careful

Which of the following is a polynomial with roots 3,5i, and -5if(x)=x^3-3x^2+25x-75f(x)=x^3-3x^2+15x-25f(x)=x^3-15x^2+25x-75f(x)=x^3-3x^2+15x-75