Most animals sleep the same way as humans do; they relax their muscles and lie down. 2 ______________, birds and horses sleep in an upright position.Which word BEST connects sentence 1 to sentence 2?

Most animals sleep the same way as humans do; they relax their muscles and lie down. 2 ______________, birds and horses sleep in an upright position.Which word BEST connects sentence 1 to sentence 2?

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