Khám phá cách thức tự quang hợp của... động vật
ổng hợp chất diệp lục là khả năng nổi trội của thực vật. Điều này vẫn được xem là đặc trưng của riêng chúng cho tới khi nhà sinh vật học người Mỹ tìm thấy một số loài động vật cũng có khả năng này. Sên biển Elysia chlorotica có màu xanh nước biển, sống phổ biến ở miền đông Hoa Kỳ và Canada. Ban đầu, các nhà nghiên cứu tin rằng chúng giống như nhiều loài khác đều lấy sẵn chất diệp lục từ các loại vi tảo cộng sinh mà chúng đã ăn, nhưng thực chất chúng lại tự tổng hợp được sắc tố này.
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