Riya visited a zoo and noticed that the rabbit was hopping quickly while the elephant was
moving slowly. She learned that the rabbit’s heart beats much faster than the elephant’s.
Why does the rabbit have a faster heartbeat than the elephant?

Answer: B. Rabbits are smaller and need more energy

Small animals like rabbits lose body heat quickly and burn food at a faster rate for their size. Their heart must beat faster to supply oxygen and energy to the body. A large elephant needs less energy per kilogram, so its heart beats slowly.

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