Explanation

Explanation

Antibodies are specialized proteins produced by the immune system.

They help identify and neutralize foreign substances like bacteria and viruses.

Explanation

The image formed at the retina of the human eye is real and inverted.

 Real and inverted is due to the presence of a convex lens in the eye.

Explanation

The basic unit of electricity is the Kilowatt hour . In simple terms, 1 kWh is the amount of energy used by a 1kW (1000 watt) electric heater for 1 hour.

Explanation

A beta particle, also called beta ray or beta radiation (symbol β), is a high-energy, high-speed electrons emitted by the radioactive decay of an atomic nucleus during the process of beta decay.

Explanation

Explanation

72 beats per minute is a good heart rate.

Complete answer:

The resting person usually has a pulse rate between 70 (beats per minute) and 80 (beats per minute).

Your risk of dying from a heart attack is lower if your heart rate is below 80 beats per minute.

A normal resting heart rate ranges from 60 to 100 beats per minute.

Explanation

• Carbon dating is used to estimate the age of fossils.
• Those that are less than 60,000 years old.
• It is composed of organic materials like wood or leather.

Explanation

Venus orbits the Sun anti-clockwise but spins clockwise on its axis.

This unique rotation is known as retrograde rotation.

Explanation

Sonar (Sound Navigation and Ranging) uses sound waves to detect and locate objects underwater.

It works by emitting sound pulses into the water

And listening for the echoes that bounce back from objects like submarines, fish, or the seafloor.

Sonar is commonly used in navigation, fishing, and underwater exploration.