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 compulsory (adj) 2 palaeontology (n) 3 extinct (adj) 4 immediately (adv) 5 ancestor (n) 6 ecology (n) 7 professor (n) a university teacher of the highest rank without delay the study of fossils as a way of getting information about the history of life on Earth no longer in existence a person in your family who lived a long time ago the study of the relation of plants and living creatures to each other and to their environment that must be done because of a law or a rule