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