Is efficiency always important for a system? In what situation might it be better to not strive for efficiency?

How can you keep track of variables in a science experiment?

Which phase of the cell cycle ensures that identical copies of the dna are made for daughter cells?

What is the main function of the central vacuole in a plant cell? a. absorbs energy from the sun to produce food b. holds water and maintains turgor pressure c. breaks down molecules to release energy d. contains the cell's genetic material