Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.
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Question: Arthropods are made up of ____ groups of living animals and one group of extinct animals.

Answer: four


Question: Phylogenetic analyses confirm ____ mitochondrial mallard clades.

Answer: two


Question: Some penguins stay in the water for up to ____ months without coming to land.

Answer:
five