In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank. Whales and dolphins are (1) _________ to be very unusual creatures. Do you know they breathe air and are warm-blooded? The (2) ________ for them being warm-blooded is because of their belonging to the mammal group. They mostly eat other animals as their (3) ________. Most of these animals live in the sea. There are very rare and few dolphins in the world which (4) ________ in fresh water, rivers and lakes. These animals or marine mammals have many records to their (5) ________, the biggest animal in the world and the largest hunter. These mammals are some of the fastest, deepest, diving and cleverest creatures.
Select the most appropriate option to fill in blank no. 2.
reason
The correct answer is reason.
Feeding their young with milk. Having hair (though often reduced in adults). The passage correctly states that one of the key reasons they are warm-blooded is their classification as mammals, as warm-bloodedness is a defining trait of the mammal class. They are indeed considered highly intelligent and complex creatures, holding records for size, diving depth, and speed among marine animals.
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Select the most appropriate option to fill in blank number 1.
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