You are investigating whether the thickness of a sponge is affected by the amount of mass placed on top of it. What is the dependent variable in this investigation?

The thickness of sponge is the dependent variable in this investigation

Explanation:

This is because in the investigation, the amount of mass is the property to be varied while the thickness of the sponge is the property to be checked.

The thickness of the sponge is dependent on the amount of mass placed on it, so the thickness of the sponge depends on the mass.

Thus, the thickness of the sponge is the dependent variable in this instance while the amount of mass is the independent variable in this investigation.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

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 =