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compulsory (adj)

immediately (adv)

extinct (adj)

palaeontology (n)

professor (n)

ancestor (n)

ecology (n)

a university teacher of the highest rank

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

a person in your family who lived a long time ago

no longer in existence

that must be done because of a law or a rule

without delay