You have a sample that contains 35 grams of Uranium-235 and 525 grams of Lead-207. Uranium-235 has a half life of 713 m. y. How old is the sample?

Robert wants to know which fertilizer will work the best for his grass. what can he do to explore this inquiry?

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

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi