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(B) What is a sex chromosome? Explain the process of sex determination in humans. Or what is a fossil? What do they indicate about the process of bio-development? (2 + 2 - 4) Q12 Describe the structure of human heart by drawing a longitudinal-cut image and display the path of blood circulation with the help of arrows. (3 + 2 + 2 = 1) Or create a nominated picture of the human digestive system and describe the digestive process occurring in the stomach and anus. 3 + 4 = 37)
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