Explanation

• Suspensions are heterogeneous mixtures that contain particles that are visible to the naked eye and settle out of the mixture over time.
• This is in contrast to solutions, which are homogeneous mixtures that contain dissolved particles that are not visible and do not settle out.

Explanation

• The freezing point of water (0°C or 32°F) is the same as its melting point.
• Which is the temperature at which water will freeze or melt.

Explanation

• Gases have neither a fixed volume nor a fixed shape.
• As their particles are widely spaced and free to move in any direction, expanding to fill their container.

Explanation

• Fuel is the major source of release of direct pollutants in air pollution.
• Primarily due to the combustion of fossil fuels, which releases harmful pollutants into the atmosphere.

Fuel combustion releases pollutants such as:

• Particulate matter (PM)
• Carbon monoxide (CO)
• Nitrogen oxides (NOx)
• Sulfur dioxide (SO2)Volatile 
• organic compounds (VOCs)

These pollutants can come from various sources, including:

• Transportation (vehicles, airplanes)
• Industrial processes (power plants, refineries)
• Residential and commercial heating and cooking

Explanation

Seed germination requires three essential conditions:

1. Water (H2O): Seeds need water to break dormancy and initiate germination.
2. Oxygen (O2): Seeds require oxygen for cellular respiration and energy production.
3. Proper Temperature: Seeds germinate within a specific temperature range (usually between 16°C to 24°C), which activates enzymes and metabolic processes.

Explanation

• The revolution of the Earth around the Sun causes the changing seasons, including Summer and Winter.
• As the Earth's axis is tilted and different parts of the planet receive varying amounts of sunlight throughout the year.

Explanation

• The correct answer is: Simple machines magnify the force you use.
• This statement is true for many simple machines, such as levers, pulleys, and wheel and axle systems.
• Which are designed to multiply the force you apply, making it easier to lift, move, or apply force to an object.

Explanation

• Solids like sawdust float on water because they are less dense than water.
• When sawdust is added to water, it forms a heterogeneous mixture.
• Where the sawdust particles remain separate from the water and float on the surface.

Explanation

• Animals, plants, human beings, and microorganisms are all examples of living components and biotic factors.
• Living components refer to the living organisms that make up an ecosystem or environment.
• Biotic factors refer to the living components of an ecosystem that interact with each other and their environment.

Explanation

An odometer or odograph is an instrument

for measuring the distance travelled by a vehicle.