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In reported speech, interrogative sentences are converted into statement form, and the correct word order for a question is changed. "How are you doing?" becomes "how he was doing" in reported speech. Therefore, option 4 is the correct answer.
Thinnest skin in the human body is
What are the small openings on the surface of plant leaves called?
Which enzymes are contained in pancreatic juice?
Which type of necrosis is frequently observed in tuberculosis infections?
What causes the curdling of milk into yogurt?
Which organism, showing characteristics of both plants and animals, is classified under the kingdom Protista?
RNA molecules are composed of nucleotides that include ribose sugars, nitrogenous bases, and which additional groups?
Which of the given pairs (Human Disease - Causative Microorganism - Mode of Transmission) is incorrect?
Which bodily fluids are known to contain pheromones?
What is the scientific name of the human species?