Matching Pairs 24/7 Listening Vocabulary MatchOnline version Test your knowledge of key concepts related to 24/7 listening and communication. by ngô nhi 1 ancestor (n) 2 immediately (adv) 3 palaeontology (n) 4 professor (n) 5 compulsory (adj) 6 extinct (adj) 7 ecology (n) a person in your family who lived a long time ago without delay no longer in existence a university teacher of the highest rank that must be done because of a law or a rule the study of the relation of plants and living creatures to each other and to their environment the study of fossils as a way of getting information about the history of life on Earth