Plz halp! the speed of light can be used to measure the time of a planet's rotation distance between objects in space mass of astronomical bodies densities of stars

Why aren't the stains like crystal violet and safranin washed away with water during simple staining?

Which of the following does not describe a physical property of iron? a iron is silvery-white or gray in color. b iron has a boiling point of about 3,000°c. c iron is a magnetic element . d iron and sulfur react to form iron sulfide.

Researchers want to use edna to look for an invasive species in the water which of the steps would be likely do last