Obtain the solution in integral form satisfying the initial condition u(x, 0)=f(x), where f(x)=|x| if |x|<1 and 0 otherwise

Consider a hot semi-infinite solid at an initial temperature of $T_i,$ that is exposed to convection to a cooler medium at a constant temperature of $T_{\infty}$ with a heat transfer coefficient of h. Explain how you can determine the total amount of heat transfer from the solid up to a specified time $t_o.$

Why is gene duplication important in evolution?

What is a protist?