The scatterplot below shows the relationship between the heart rate and oxygen uptake at 16 different points during Kyle's exercise routine. Oxygen uptake is defined as the measure of a person's ability to take in oxygen and deliver it to the working tissues, and ability of working tissues to use oxygen. The line of best fit is also shown.

The table below shows the approximate masses of a dust particle and a grain of pollen. dust particle 0.000000778 g grain of pollen 0.00000000155 g the mass of a dust particle can be estimated and written in the form a × 10^b, where a = 8 and b = the mass of a grain of pollen can be estimated and written in the form a × 10^b, where a = 2 and b = based on the estimates, the mass of a dust particle is approximately blank times larger than the mass of a grain of pollen.