Figure below shows four components of blood. Which component helps carry oxygen throughout the body?
A. 
B. 
C. 
D. 
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During a Science lesson, the teacher told the students that unicellular organisms do not have a transport system. Which of the following questions should the pupils ask?
A. Do substances enter unicellular organisms by diffusion?
B. Do substances enter unicellular organisms by transfusion?
C. Do unicellular organisms need only sunlight for survival?
D. Do unicellular organisms produce their own food?
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