How can we recognize polar and no polar molecules?

In a closed or isolated system , matter can not be created or destroyed. it can change forms but is conserved true or false

The gulf stream is a warm water current that flows away from the equator to northern europe. witch of these does it cause. a. crashes of warm and cool water in the ocean b.colder climates near the equator c.large waves on the cost of europe d.warm climates in northern europe

Which of the following is true about the speed of light? it depends on the wavelength.