Explanation

• The brain is the command center of the body, controlling everything from movement and sensation to thought and emotion.
• It processes information, sends signals to muscles and glands, and regulates various bodily functions, making it the central control system of the body.

Explanation

• The Earth rotates on its axis, completing one full rotation in 24 hours.
• This is the equivalent of 1,440 minutes or 86,400 seconds.
• This rotation is what gives us day and night, as different parts of the planet face towards or away from the Sun.

Explanation

• The freezing point of water is 0°C (zero degrees Centigrade). 
• The boiling point of water on the Centigrade scale (also known as the Celsius scale) 100°C (one hundred degrees Centigrade).

Explanation

• There are around 639 skeletal muscles.
• The three main types of muscle include skeletal, smooth, and cardiac.
• The sartorius muscle is a thin, long, superficial muscle in the anterior compartment of the thigh.

Explanation

A compound machine is a machine that is made up of two or more simple machines.

A bicycle, a crane, wheel borrow and scissors are examples of compound machines because they are made up of multiple simple machines, such as:

• Wheels and axles (simple machine: wheel)
• Pedals and levers (simple machine: lever)
• Gears and pulleys (simple machine: pulley)
• Inclined planes (simple machine: inclined plane)

Explanation

Force cannot change the content of an object, as it only affects the object's motion, shape, and position, but not its composition or internal structure.

Explanation

• Heat is a form of energy that flows from a region of high temperature to a region of low temperature.
• This flow of energy occurs through the transfer of kinetic energy from particles in motion.

Explanation

• The heart is the pumping station of the human body.
• It is responsible for pumping blood throughout the body.
• It supplying oxygen and nutrients to tissues and organs.

Explanation

The the life cycle of a butterfly:

• Eggs: The female butterfly lays eggs on a leaf.
• Caterpillar (Larva): The egg hatches into a caterpillar, which eats and grows.
• Pupa (Chrysalis): The caterpillar transforms into a pupa, a resting stage where it undergoes metamorphosis.
• Adult (Butterfly): The pupa emerges as a fully formed adult butterfly, ready to fly and reproduce.

Explanation

• A pulley is a simple machine that uses grooved wheels and a rope to raise, lower, or move a load.
• It changes the direction of the force, making it easier to lift or move heavy loads.
• Examples: Raising a load and A flag pulley.