If I start with 100grams of substances before the reaction, how many
grams will I have after?

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

According to this food web which of the following would be considered primary consumers

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?