All donated blood is tested for syphilis, hepatitis, and hiv according to guidelines established by the food and drug administration. a. true b. false

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

Ruby is conducting an investigation. an advantage of her design is that she can use a large range of variables, with that she can not be sure that one variable is the cause of another. what kind of investigation is ruby most likely conducting?

30 points why do tornadoes happen more frequently in the summer? they require warm air. they form over large, warm bodies of water. they require dry air. they require dust which is present in the summer.