light and heat are given off as a result of converting the input energy which i would guess is electrical energy or in case of gas or oil its chemical energy
if it help pick as best :)
1cm=10,00micrometers
7.5micrometers
7.5micrometers=0.00075cm
Said to have more organisms .
I think it is archaebacteria
or maybe virus
most probably archaebacteria idk