HELP PLZ

Why is polarity important?

Witch type of microscope is used to view very small cell components like proteins and dna?

Ayoung boy has been found and police are trying to locate his family they take a dna sample from him and begin collec dna samples from families who have missing children if police use dna samples only from the fathers, which type of dn technology can they use to identify the boy's parent? y-chromosome analysis omtdna (mitochondrial dna) analysis vntrs (variable tandem repeats) o pcr (polymerase chain reaction) analysis

You see a white marker with an orange circle and black lettering. what does this marker tell you