Animals communicate with one another in many interesting ways. These may consist of signs, gestures, looks, sounds, smells or even light produced by the body.
Song and dance are the other means of communication. When faced with danger, animals warn others using signals such as mock charges, grimaces or sound.
They also call their mates, inform other members of the group about the source of food, advertise territory and 'teach' the young the ways of the world. Baby birds call their parents for help and attention and demand food. Far from being a silent world, the ocean is a noisy place.
Fishes, molluscs, sea lions, walruses, whales and dolphins chatter away in the waters using a variety of sounds-whistles, squeaks, clicks and groans which range from low pitch to ultrasonic sounds beyond the range of human hearing. Whales and dolphins are sometimes called the 'musicians of the sea' as birds are of the sky.
According to the passage, animals use sounds to do which of the following? Choose the correct answer from the options given below.
Animals use sounds to advertise territory, warn of dangers, call their mates and inform about food, so the answer is 1, 2, 3 and 5.
The passage says animals warn others of danger using sounds and signals.
They also call their mates using sound.
They inform other members of the group about the source of food.
They advertise territory as one purpose of their calls.
Inviting enemies is not a purpose mentioned in the passage, so it is excluded.
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