Fill in the blanks.
{"id":22391,"questions":[{"type":"fill-in-blanks","id":"508","dataJson":{"prompt":"Fill in the blanks.","options":{"oxygen":[{"key":"carbon dioxide","label":"carbon dioxide","value":"carbon dioxide"},{"key":"oxygen","label":"oxygen","value":"oxygen"}],"plants":[{"key":"plants","label":"plants","value":"plants"},{"key":"animals","label":"animals","value":"animals"}],"carbon dioxide":[{"key":"carbon dioxide","label":"carbon dioxide","value":"carbon dioxide"},{"key":"oxygen","label":"oxygen","value":"oxygen"}]},"feedback":"","template":"By taking in {{carbon dioxide}} and releasing {{oxygen}}, {{plants}} are essential to the maintenance and balance of gases in the atmosphere. ","question_type":1,"validResponse":{"oxygen":"oxygen","plants":"plants","carbon dioxide":"carbon dioxide"},"fileboyImageId":""}}]}
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Select the missing words in the text.