Which describes the genetic code in a human?
a) different genetic codes appear in each different type of cell.
b) every human has the same exact genetic code.
c) genetic codes change frequently in reaction to external factors.
d) a genetic code determines the physical traits of the body

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.