Explanation

O negative (O⁻) blood group is called the universal donor.

It can be transfused to any blood group (A, B, AB, or O).

O⁻ lacks A, B, and Rh antigens, preventing immune reactions in recipients.

Explanation

Bile is produced by the liver but stored in the gall bladder.

The gallbladder releases bile into the small intestine when fatty foods are present.

Bile helps in the digestion and absorption of fats.

It also neutralizes stomach acid entering the small intestine.

Gall bladder function is crucial for efficient fat metabolism in the body

Explanation

Metalloids have properties of both metals and non-metals.

They can conduct electricity better than non-metals but worse than metals.

Examples include silicon, boron, and germanium.

Metalloids are widely used in semiconductors and electronics.

Their mixed properties make them important in modern technology.

Explanation

Explanation

An oasis is a fertile area found in a desert.

It has a natural source of water, such as springs or underground water.

The presence of water allows plants and trees to grow.

Oases often support human settlements and agriculture.

They are crucial resting points for travelers and caravans in deserts.

Explanation

The Sun's diameter is approximately 1.4 million kilometers (864,000 miles)

Making it about 109 times wider than Earth, 

A massive size that dominates our solar system as a giant ball of hot hydrogen and helium. 

Explanation

The term is Continental Drift.

It was proposed by Alfred Wegener.

It explains that continents were once joined together and later moved apart.

This movement occurs over millions of years.

Continental drift helped lead to the modern theory of plate tectonics.

Explanation

Helium is the rarest, as it's present in much smaller trace amounts (around 5.2 ppm)

Oxygen: ~209,000 ppm (20.9%)

Carbon Dioxide: ~420 ppm (0.04%)

Neon: ~18 ppm (0.0018%)

Helium: ~5.2 ppm (0.00052%) 

Xenon is generally considered the rarest of the common noble gases,

Explanation

This minimum required speed is called escape velocity.

Escape velocity of Earth is about 7 miles per second (≈ 11.2 km/s).

At this speed, an object can overcome Earth’s gravitational pull.

It does not depend on the mass of the rocket.

Escape velocity is crucial for space missions and satellites.

Explanation

Acceleration due to gravity on Earth is denoted by g.

Its standard value is 32 ft/s² (or 9.8 m/s²).

It acts downward toward the center of the Earth.

Gravity affects the motion of falling objects.

The value of g slightly varies with altitude and location.