The term sustainable living is often referred to as which of the following? a. green living b. active lifestyle c. healthy lifestyle d. meat-free living

A.green living

Explanation:

Sustainable living is the attempt to reduce the use of natural resources like fossil fuels, forests, and others by the human society so that these resources remain available for future generation. It is associated with maintaining the balance in the ecological, economical and societal needs to lead a healthy lifestyle. As it mainly emphasizes over the protection of the environment then it is also called as green living.

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 =