Which statement is correct concerning the cell walls?
all plants remain rigid because of the cell walls.
some plants can remain standing without water because of stiff cell walls.
plants do not need cell walls if they have water.

The metric unit of electrical power is the watt volt ampere ohm

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.