Australian embryologists have found evidence that suggests that the modern elephant is descended from an aquatic animal and the trunk had originally evolved as a kind of snorkel. The snorkel-trunk was in place when the ancestor was an aquatic animal. If the modern elephant's trunk evolved from a short-nosed aquatic animal, then it needs to be worded another way.
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vishaljain23231I want to know why "is" is used in the part "the elephant is descended"Well, the elephant is a modern animal. It is descended from its ancestors, as we all are.