Final answer:
The house fly, with a mass of 2×10-5 kg, is heavier than the mosquito, which has a mass of 2.5×10-6 kg, since the numerical exponent for the house fly's mass is higher (-5 compared to -6).
Step-by-step explanation:
The comparison of the masses of a mosquito and a house fly in scientific notation is a question of mathematics, but since it involves the topic of mass and measurements, it can also be considered a physics question. The masses given are 2.5×10-6 kg for the mosquito and 2×10-5 kg for the house fly. To compare these, we need to understand scientific notation.
In scientific notation, a number is written as a product of a number between 1 and 10 and a power of ten. Hence, a mosquito with a mass of 2.5×10-6 kg has a lesser mass compared to a house fly with a mass of 2×10-5 kg because the exponent -6 indicates a smaller quantity than -5. The house fly is an order of magnitude, or ten times, heavier than the mosquito.