Low-frequency red light is used in dark rooms because it does not expose the film. this is because the red light has a low a) amplitude. b) energy. c) intensity. d) wavelength.

Explain how fossils scientists make discoveries about the lives of organisms and about how environments have changed over time. plz hurry up it time

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?