Which answer best describes the concept of metabolism?
a: the oils in a nut yield energy for the squirrel
b: in the fall a bear builds a den
c: a person is shivering in the cold wind
d: mold grows in a damp area

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.