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level four

level four

خورشید

خورشید فایل صوتی ندارد The Sun Ever since early humans first became aware of their environments, they have recognized the

level four

ترکیب زمین

ترکیب زمین فایل صوتی ندارد The Composition of the Earth As a child, you might have wondered what you would

level four

فتوسنتز

فتوسنتز فایل صونی موجود نیست Photosynthesis Did you know that plants can “eat” light? Green plants obtain their energy directly

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