6. Observation is the process of gathering information through the senses, including sight,
sound, taste, smell, and touch. Which
observation is an example of sensory data?
A. The mass of a pebble is 25.0 g.
B. The volume of a pebble is 5.0 cm
C. A white pebble is speckled with gray spots.
D. A pebble does not conduct an electric
current.

no. dot product   =0 when vecs at right angles

cant without the picture! ?

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 =