Which statement is true? (2 points) gravity is the force of attraction between two objects with mass and is dependent on the distance between these objects. gravity is the force that repels two objects that have opposite charges. it is dependent upon the charges of the objects. gravity is a force that keeps objects moving in space. the less the object weighs, the further out in space gravity will pull the object. gravity is the force of resistance to a change in position. the greater the distance between two objects, the greater this force will be.

The first choice is the true statement.

Gravity is the force of attraction between any two objects with mass.  Its strength depends on the size of both masses and the distance between them.

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 =