Which of these are part of the electromagnetic spectrum? Question options:

gamma rays

visible light

microwaves

sound waves

radio waves

A, C, E

Explanation:

Gamma rays, Microwaves, and Radio waves

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 =

the answer you are looking for is d. there are no holes for blood to enter or leave the system. your welcome