Read the text again, and decide if the sentences (1 - 5) are T (true), F (false) or DS (doesn't say). 1 Cetaceans are a type of mammal. 2 Dolphins use their blowholes to breathe underwater. 3 Small pods are more common than large ones. 4 Scientists found out that dolphins used 'names' in 2013. 5. Martina has participated in studies about dolphin communication.

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