When a patient’s immune system becomes reactive to a drug, this is an example of?

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What causes the Moon’s phases?

A. The Sun lights up only one half of the Moon and as the Moon orbits the Earth we can sometimes see the unlit side of the Moon. B. The Sun lights up only one half of the Moon and as the Sun orbits the Earth we can sometimes see the unlit side of the … What causes the Moon’s phases?Read More...

“Each electron in an atom must have its own unique set of quantum numbers” is a statement of_______________?

A. Aufbau principle B. Pauli exclusion principle C. Hund’s rule D. Periodic law...

The ‘stone’ formed in human kidney consist mostly of_____________?

A. Calcium oxalate B. Sodium acetate C. Magnesium sulphate D. Calcium...

Tooth decay is caused by?

A. Salt B. Sugar C. Calcium D. Formalin...

speed of sound in dry air at 20 °C is___________?

A. 353 m/s B. 345 m/s C. 343 m/s D. none of them...