Four students all do the same experiment for the science fair. They test reaction times for pushing a button when a specific color is shown. Their data is as follows Reaction Time (seconds) throughout 6 trials :

Student 1: 0.44, 0.41, 0.47, 0.39, 0.46, 0.42

Student 2: 0.35, 0.43, 0.38, 0.39, 0.42, 0.44

Student 3: 0.41, 0.52, 0.57, 0.46, 0.55, 0.49

Student 4: 0.42, 0.43, 0.41, 0.42, 0.41, 0.42

ANSWER OPTIONS:

Put the students in order from most to least reliable data

- student 1,2,3,4
-student 2,1,4,3
- student 4,1,2,3
-student 3,2,1,4

b.

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 =

the answer is false. this is because for ice to melt, it requires latent heat of melting. latent heat means heat energy required to change phase without any increase in temperatures. therefore, the ice will take energy from the environment to melt hence atmospheric temperatures will reduce.