The direction of the magnetic field in a certain region of space is determined by firing a test charge into the region with its velocity in various directions in different trials. the field direction is 1. the direction of the velocity when the magnetic force is a maximum. 2. the direction of the velocity when the magnetic force is zero. 3. none of these 4. perpendicular to the velocity when the magnetic force is zero. 5. the direction of the magnetic force.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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there are no components of a physical goal mentioned on the list of choices that you've provided.

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 =