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What is the main idea of this passage?
Like humans and many other mammals, she explained, the elephants have a wide range of calls and signals for different purposes—to secure their defense, warn others of danger, coordinate group movements, reconcile differences, attract mates, reinforce family bonds, and announce their needs and desires.
a) elephants use different calls for different purposes
b) elephants are very intelligent animals
c) elephants are like humans in several ways
d) elephants communicate to warn of danger
a) elephants use different calls for different purposes