细胞是生物体的基本结构和功能单位。你知道微小的细胞是如何在生物体体内运作的吗?来听美国加州的老师上一堂生物课吧!A group of similar cells that do the same job in an organism is called a tissue.Both plants and animals have tissues.Muscle cells in your legs make up muscle tissue,which allows you to move your legs.Other kinds of tissues in an animal’s body include blood,nerves,bone, Cell is the basic structure and function unit of organism. Do you know how tiny cells work in living organisms? Listen to a biology teacher in California, USA. A group of similar cells that do the same job in an organism is called a tissue. Both plants and animals have tissues.Muscle cells in your legs make up muscle tissue, which allows you to move your legs.Other kinds of tissues in an animal’s body include blood, nerves, bone,