They tend to call you when they need or want something. 当他们需要或者想要某些东西时他们就叫你。 12. 17kb Tend your tadpoles. You never know when you might need a Pal. 别忘了你的发小,说不准什么时候你会需要伙伴。 13. 15kb To build a business, you tend to "expand" the brand....
Cells that were taken from adults resulted in abnormally developed tadpoles(蝌蚪). The next successful cloning experiments also resulted in cloned frogs. John Gurdon cloned South African frogs in 1962. His use of adult cells disproved the previous theory that only young cells could be used in the...