Answer:
Microtubules
Explanation:
These filament-like structures are a major component of the cytoskeleton of the cell and help is maintain asymmetrical cell shape. They are composed of tubulin molecules arranged to form a 'hollow straw' attached to the cell membrane end to end . The contraction and lengthening of these microtubules are controlled by the addition of removal these of tubulin molecules to vary its length.
Water is a polar molecule because its opposite ends have opposite electric charges.
Relative humidity. A psychrometer has two thermometers, one for dry-bulb temperature and the other wet-bulb temperature.
