Why are common names not a good reference to a species?

Ryan rears sheep for their wool. recently the quantity of wool that ryan gets has diminished. this is because the new sheep are not that wooly. ryan should add which nutrient to their feed so that the sheep becomes more wooly? a. cornb. ironc. cottonseedd. vitamin a

This part insulates the reaction chamber from the transfer of heat to or from the surrounding environment

Which statement names a physical property of wood? wood does not rustwood can burnwood can rotwood is softer than coal