If a boy notices a swelling around his nipples during puberty, what is the likely cause

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

The tubes transporting minerals and water upward are called ?

What organ systems are working to you cool down after a workout?