Question #4
If a disturbance is parallel to the direction of travel of a wave, the
wave is classifed as
(1) longitudinal
(2) transverse
(2) electromagnetic
(3) torsional

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 =

answer a fan shaped mass of sediment deposited at the base of a mountain front do to an abrupt change in stream gradient;

1 is a answer of a question