Explanation

"Pakistan's polio immunization campaign began in 1974, but eradication efforts officially started in 1994.

The country had the most polio cases worldwide in 2014."

Explanation

The Earth rotates on its axis from west to east. Because of this, the Moon, the Sun and all other celestial objects appear to move from east to west across the sky.

Explanation

Vitamin C is essential for growth and repair of tissues in the body.

Protein formation: Vitamin C helps form collagen, a protein used to create skin, tendons, ligaments, and blood vessels.

Wound healing: Vitamin C helps heal wounds and form scar tissue.

Bone, teeth, and cartilage repair: Vitamin C helps repair and maintain bones, teeth, and cartilage.

Iron absorption: Vitamin C helps the body absorb iron. 

Vitamin C is also an antioxidant that promotes healthy teeth and gums.

A deficiency in vitamin C can lead to scurvy.

Explanation

The Earth rotates at 15° per hour.

It spins on its axis once every 24 hours.

At the equator, the Earth's spin is about 1,000 miles per hour (1,600 km per hour).

The Earth rotates counterclockwise, from west to east.

 The Earth also moves around the Sun, which is called its orbit.

It takes the Earth 365 1/4 days to complete one orbit around the Sun.

Explanation

Bryophytes are a group of non-vascular plants, which include mosses, liverworts, and hornworts.

They are characterized by their lack of vascular tissue (xylem and phloem) and reproduce via spores instead of seeds.

Explanation

The location below the earth's surface where the earthquake starts is called the hypocenter, and the location directly above it on the surface of the earth is called the epicenter

. Sometimes an earthquake has foreshocks.

Explanation

The central atom of hemoglobin is iron, which binds to oxygen in the blood.

Hemoglobin is a protein in red blood cells responsible for transporting oxygen from the lungs to the rest of the body.

Explanation

Scalar quantities are physical quantities that have only magnitude (amount or size) but no direction.

Examples of scalar quantities include:

• Mass
• Temperature
• Time
• Energy
• Distance

Explanation

Ostriches, like some other birds, eat pebbles and small stones to help with digestion. 

They swallow these pebbles, which then accumulate in their gizzard, a muscular organ in the digestive system.

The pebbles help grind up the food.

It especially tough plant material, in the gizzard, making it easier to digest.

This process is called "grit digestion".

Explanation

Epistasis occurs when the expression of one gene is affected by another gene at a different locus.

This interaction can mask or modify the effects of the other gene, leading to variations in phenotypes.