The diagram shows a ramp with a toy car at the bottom. a string attached to the front of the car and the string goes over a pulley at the top of the ramp. a weight is attached to the other end of the string. what would be most responsible for the toy being pulled up the ramp ?

a. friction
b. gravity
c. kinetic energy
d. momentum

The answer would be Gravity.

Gravity is pulling the weight down, which is pulling the car up the ramp.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.

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 =