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level four

خورشید

خورشید فایل صوتی ندارد The Sun Ever since early humans first became aware of their environments, they have recognized the importance of the sun’s heat… ادامه »خورشید

فتوسنتز

فتوسنتز فایل صونی موجود نیست Photosynthesis Did you know that plants can “eat” light? Green plants obtain their energy directly from the sun, by converting… ادامه »فتوسنتز