Imagine you and your partner are preparing a serial dilution of a sample of pond water. While you were watching your agar, your partner labeled several test tubes with the numbers below . Which of these correctly expresses a dilution?

Nucleus is the organelle that contains chromosomes

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It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on