Plz why is nitrogen important for living things?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Explain that newton first law, second law and third law of motion?

What is the mass of 0.46 mil of mgcl2