1. if you rub a neutral glass rod with silk, the silk acquires a negative charge. if you rub a neutral glass rob with a rubber rob, the rubber rod acquired a negative charge. if you rub a neutral rubber rod with silk the rubber rob acquired a negative charge. which of the three materials know? 2. you are wandering around the park on a cold winter day in january. there are two benches— one is made from metal and one is made from wood. which bench would not feel as cold? how do you know

1. Answer : Silk, neutral glass rod and neutral rubber rod.

Explanation : if you rub a neutral glass rod with silk, the silk acquires a negative charge.if you rub a neutral glass rob with a rubber rob, the rubber rod acquired a negative charge.If you rub a neutral rubber rod with silk the rubber rob acquired a negative charge.

Then we can see that use of only silk, glass rod and rubber rod in this work.

2. Answer : wood bench would not feel as cold.

Explanation : wood bench would not feel as cold. because metals feel colder or hotter to the touch than other materials at the same temperature because they're good thermal conductors. wood is a thermal insulator which is don't transfer of heat easily.  

dopamine..

"it was found that some people who were taking the drug l-dopa to raise their levels of dopamine were developing schizophrenic-like symptoms supporting research a strength of the dopamine hypothesis is that there are many studies which have shown support for the neurochemical explanation."

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 =