Which type of ecological system experiences no input or output of energy or material?

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

Why did the federal government end its support of yucca mountain as a site for long-term storage of nuclear water

Anormal strand of dna is shown below, followed by the same strand of dna after mutations have occurred.