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The figure above illustrates three types of cells. Which of the following cells belong to the correct system?
The diagram above shows the flow chart of the organization of a multicellular organism. What are W, X and Y?
Which of the following is an epithelial tissue?
Which of the following system has the organs listed above?
The diagram above shows the flow chart of the organization of a multicellular organism. Which of the following can be represented by Y?
The maintenance of a relatively constant environment is called
Which of the following statements best describe the internal environment?
Which of the following are factors affecting the internal environment?