What term describes organisms that live on or in the ocean floor?

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

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite

In which of the following relationships is one organism always benefited while the other organism is always harmed