Do you have a student who wiped the Iodine with a tissue paper and the tissue paper turned purple. What does this color change in the tissue paper indicates? PLEASE HELP ME I DONT GET I :(

Sydney drew a flow chart to illustrate the nitrogen cycle.which labels best complete the flow chart? x: producers undergo photosynthesis.y: nitrogen compounds are released into the air.x: nitrogen compounds are released into the air.y: producers undergo photosynthesis.x: free nitrogen is in the atmosphere.y: producers absorb nitrogen compounds through their roots.x: producers absorb nitrogen compounds through their roots.y: free nitrogen is in the atmosphere.

If assuming tasting ptc as a simple gene trait,what other genotype would you select to put in this missing genotype box that could result in this phenotype

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?