Explanation

• The stomach is an organ involved in digestion, not waste elimination.

1. Lungs: remove carbon dioxide through exhalation
2. Kidneys: filter waste and excess substances from the blood, producing urine
3. Skin: removes waste through sweating
4. Liver: detoxifies harmful substances and aids in their removal

Explanation

The Milky Way is the galaxy that contains our solar system

It consists of 100–400 billion stars

The Milky Way is a huge collection of: 

• stars
• dust
• gas

It is visible as a hazy band of white light

Additional Information

The nearest galaxy to our Milky Way is Andromeda

Largest galaxy in the Universe is a Spiral galaxy 

Explanation

Inclined planes are used to move heavy loads over vertical obstacles.

The inclined plane is one of the six classical simple machines defined by Renaissance scientists. 

ND20-1-2023

Explanation

The Earth's Moon has considerably less mass than the Earth itself.

Not only is the Moon smaller than the Earth, but it is only about 60 percent as dense as Earth.

Thus, the gravitational attraction on the Moon is much less than it is here on Earth, and a person weighs less on the Moon.

ND20-1-2023

Explanation

The physical weight of our body is determined by the pull of gravity on it

ND20-1-2023

Explanation

When two surfaces slide over one another the tiny bumps push on each other.

Friction causes a force on a surface that is in the opposite direction to its motion.

Friction can be reduced by the application of lubricants

ND20-1-2023

Explanation

 A solution that has a relatively less amount of solute in comparison to the solvent is called a dilute solution.

****

ND20-1-2023

Explanation

Chromatography is one of the latest techniques, which is used to separate the colored components of a mixture.

Ink is a mixture of several dyes

therefore we can separate those colors from one another using chromatography.

****

ND20-1-2023

Explanation

The smallest particle of a compound is called a molecule.

Molecules are formed when atoms of the same or different elements combine. 

while

The matter is made up of the smallest particles called atoms

***

ND20.1.2023

Explanation

In a solid state, particles cannot move from their position.

They can only vibrate at their mean position.

 The particles in solids vibrate about fixed positions; even at very low temperatures.

***

ND18-1-2023