The masses of four different insects are given below.

Insect A: 2.19*10^-4 g
Insect B: 5.00*10^-3 g
Insect C: 9.0*10^-2 g
Insect D: 1.50*10^-3 g

What is the order of these insects from heaviest to lightest?

a. Insect D; Insect A; Insect B; Insect C
b. Insect C; Insect B; Insect A; Insect D
c. Insect A; Insect D; Insect B; Insect C***
d. Insect C; Insect B; Insect D; Insect A

To determine the order of the insects from heaviest to lightest, we need to compare their masses. The given masses of the insects are:

Insect A: 2.19*10^-4 g
Insect B: 5.00*10^-3 g
Insect C: 9.0*10^-2 g
Insect D: 1.50*10^-3 g

To compare these numbers, we can ignore the scientific notation for now and focus on the values before the multiplication.

Comparing the values in non-scientific notation:
Insect A: 0.000219 g
Insect B: 0.00500 g
Insect C: 0.0900 g
Insect D: 0.00150 g

Now it is clear that the order, from heaviest to lightest, is Insect C, Insect B, Insect D, and Insect A.

So, the correct answer is:

b. Insect C; Insect B; Insect A; Insect D

In terms of 10^-4, the masses are

2.19, 50.0, 900, 15.0

Looks like you need to try again.