Explanation

• Sublimation is the transition of a substance from the solid to the gas phase without going through the liquid phase.
• This means that a solid changes directly into a gas, without first melting into a liquid.

Explanation

• Distillation is a process that involves boiling a liquid and then collecting the condensed steam.
• Which is free from many impurities, resulting in a purified liquid.
• This process is commonly used to purify water, alcohol, and other liquids.

Explanation

Water from domestic use is not a typical cause of air pollution.

Air pollution is typically caused by the release of harmful substances into the atmosphere, such as:

• Burning of fuel (transportation, industrial processes)
• Burning of solid waste (incineration, landfills)
• Coal (mining, combustion)

Explanation

Air pollution is caused by the release of harmful substances into the atmosphere, which can come in the form of:

• Solids (particulate matter, such as dust, soot, and smoke)
• Liquids (aerosols, such as mist and fog)
• Gases (carbon monoxide, nitrogen oxides, sulfur dioxide, and volatile organic compounds)

Explanation

• The embryo is the miniature plant inside a seed, consisting of the radicle (root), hypocotyl (stem), and cotyledon (seed leaf).
• It contains the structures that develop into the root, stem, and leaves of the new plant.

Explanation

• Warm-blooded vertebrates, also known as endothermic vertebrates.
• Warm-blooded are animals that maintain a constant body temperature, regardless of the temperature of their surroundings.
• They are able to generate heat internally and regulate their body temperature, allowing them to maintain a relatively constant body temperature.
• Examples: birds and mammals.

Explanation

Vertebrates are divided into two main groups based on temperature regulation:

1. Cold-blooded (ectothermic) vertebrates, which include: Fish, Amphibians and Reptiles
2. Warm-blooded (endothermic) vertebrates, which include: Birds and Mammals (including humans)

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

• A lever is a stiff bar that rests on a support called a fulcrum, which lifts or moves loads.
• The fulcrum is the point where the lever pivots, and it can be used to change the direction of a force or to gain a mechanical advantage, making it easier to lift or move heavy loads.
• Examples: Hammer, crow bar, a pair of pilers and seesaw.

Explanation

• Bacteria are unicellular organisms.
• They have cell wall but don't have proper nucleus.
• It doesn't contain chlorophyll.
• It is used to make medicines, yogurt and cheese.
• Algae are unicellular with proper cell wall and nucleus.
• It contain chlorophyll.
• It causes diseases: Cutleria, Ulva and Volvox.