How do plants take in and give gas?

What does it mean by rm in electrical system? One of the lines in the Balmer series of the hydrogen atom emission spectrum is at 397 nm. It results from a transition from an upper energy level to n 2. What is the principal quantum number (or n va? Why is it easier to swing your legs back and forth when they are bent? What environment is gold found in? What are the three types of waves produced in earthquake and how does each move through the earth .? How long is one year on mercury comparison to earth years period of revolution? An earthquake with a magnitude of 7 has how many more motions than an earthquake with a magnitude of 4? What year was radon discovered? Why is dune vegetation important? Why does co2 need two toothpicks bewtween each oxygen atom and the carbon atom? What are asteroid sized objects that develop a huge bright tail when they come near the sun? What is the input for the Krebs cycle? What properties are the most important to identify nonliving things? At what kind of plate boundary do most underwater volcanoes occur? What paint does not conduct electricity? What is the word to reduce the volume of gas so that it can fit into a smaller container? What is the location of an interneuron in a spinal reflex pathway? What happens to cytoplasm during interphase? Can isotopes have positive and negative charges? Is saliva a matter?