ANSWER: C. Complementary base pairing occurs only between the probe and the target gene.
Answer:
Small external openings of lungs help in two ways:
1. It helps in trapping the dust and pathogens like bacteria, fungal spores et cetera. Larger opening would provide dust and pathogen a wider area to enter into the body.
2. The smaller opening prevents the drying of the respiratory membrane. A moist membrane is essential for the successful exchange of oxygen and carbon dioxide in the lungs.
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Evolution is the change in the gene pool of a population over time
