While watching a recent science fiction movie, one klingon spaceship blows up a droid spaceship with a laser gun. the klingon crew watches out the port window and covers their ears to muffle the noise from the explosion. scientifically, this scene is inaccurate because
a)
light can not reflect off objects in the vacuum of space.
b)
they would not be able to see anything outside the window.
c)
lasers can not be transmitted through the vacuum of space.
d)
the sound of the explosion would not be transmitted back to their ship.

D)  the sound of the explosion would not be transmitted back to their ship.

Explanation:

Sound is a mechanical wave. A mechanical wave requires a medium to travel and transfer energy. It travels be compression and rarefaction of the medium. Since in space it is vacuum, the sound energy by the explosion of the spaceship would not be able to travel through the space, the Klingon crew are not required to cover their ears to muffle the noise. This scene would be inaccurate scientifically.

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 =

1. metals

2. metalloids only

3. nonmetals only

4. metals and metalloids

5. metalloids and nonmetals

i just took this assignment so this is correct