How do benign and malignant tumor differ? Malignant tumors can usually be completely removed with surgery; benign tumors cannot.
Benign tumors are harmless; malignant tumors are life-threatening.
Malignant tumors are painless; benign tumors cause pain when they invade or press on nerves.
Benign tumors are surrounded by a capsule; malignant tumors invade surrounding tissue.

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.