Insect A: 2.19*10^(-4) g = 0.000219 g
Insect B: 5.00*10^(-3) g = 0.005000 g
Insect C: 9.00*10^(-2) g = 0.090000 g
Insect D: 1.50*10^(-3) g = 0.001500 g
Then, the order of these insects from heaviest to lightest is:
Insect C, Insect B, Insect D and Insect A