Which of the following is a true statement? A Periods form horizontal rows; groups form vertical columns
B Groups form horizontal rows; periods form vertical columns
C Categories form horizontal rows; gases form vertical columns
D Gases form horizontal rows; categories form vertical columns

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain

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

Most of the carbon on earth is stored in the form of