Passive is when materials travel or move across some cell membranes that doesn't use cell energy.
Active is the meaning of a movement that crosses across some cell membranes that requires the use of cell energy.
Answer: The answer is that passive doesn't use cell energy but active uses cell energy.
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When a biologist counts the number of zebras in a population each year and notices an increase in the zebra population, this would be an example "of <span>observation"</span>
Gravity increases as mass increases.
Gravity decreases when distance decreases
