How does this action cause the skateboarders speed to decrease?

Pls help

B. It increases the force of friction.

Explanation:

When the leg is being dragged with the girl while she is riding the skateboard, there is more contact surface area to the ground compared to when the leg was on the board so the force of friction between the girl & skateboard and the ground increases, causing her speed to decrease.

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =

can u provide the graph and if its not possible

then i can tell u the segment where the

average time interval starts degrading is the segment where the car is slowing down