A negative membrane potential was recorded when the tip of the microelectrode was:

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the answer is admiramos

the rule for verbs is whoever you are referring to (in this case 'nosotros'), you need to change the ending of the word.

nosotros - amos

yo - o

tu - as

el, ella, usted - a

ellos, ellas, ustedes - an

(examples: nosotros bailamos (instead of bailar) or yo hablo (instead of habla)

i believe the answer would be b. hope it : )

a compound light microscope is used to magnify objects in steps.  

hope it