The scientific notation for the number of dust mites is 2.0 x 10⁶, and the scientific notation for the length of the dust mites is 4.2 x 10⁻³.
The correct option is C.
Scientific notation is a method of expressing very big or extremely small numbers using powers of ten.
A number is represented in scientific notation as the product of a number between 1 and 10 (the coefficient) with a power of ten.
The number of places the decimal point must be moved to produce a number between 1 and 10 is represented by the power of ten.
For example, the number 2,000,000 can be written in scientific notation as 2 x 10⁶.
The coefficient is 2, which is between 1 and 10. The power of 10 is 6, which represents the number of zeros in the original number.
Similarly, the length of dust mites is 0.0042 mm.
This number can be written in scientific notation as 4.2 x 10⁻³.
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