Explanation

Hemoglobin is the respiratory protein of many arthropods

Explanation

Hilal is known as the 'crescent' in astronomical terms.

It's the part of the moon that shows its light visible from the earth.

Hilal appears shortly after sunset on the day that the ijtimak (conjunction) has occured

Explanation

The structure of the earth is divided into four major components: the crust, the mantle, the outer core, and the inner core. 

Explanation

The ozone layer is located in the stratosphere and surrounds the entire Earth.

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Explanation

Explanation

White blood cells, also called leukocytes are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.

The lifespan of white blood cells ranges from 13 to 20 days

Explanation

The Pascaline was designed and built by the French mathematician-philosopher Blaise Pascal between 1642 and 1644.

Explanation

Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, form part of the Hubble sequence.

Explanation

The medulla oblongata is a cone-shaped neuronal mass in the brain located in the brain stem, directly below the pons and anterior to the cerebellum.

Explanation

Marasmus is a deficiency of all macronutrients: carbohydrates, fats, and protein

Marasmus is a form of malnutrition disorder caused due to deficiency of protein in food.