Explanation

sewage and garbage = 80% of the total pollution (in the world)

Source: United Nation Environment Programme

Explanation

• A land with high rainfall, typically between 250 to 450 mm annually, is a forest.
• Forests are areas with high vegetation density, and the abundant rainfall supports the growth of a diverse range of plant and tree species.

Explanation

• A predator is an organism that feeds directly on another living organism, called the prey.
• Example: A lion hunting a deer

Explanation

Sunlight is white but appears yellow due to light scattering in the Earth's atmosphere.

Explanation

It is made of O3 

Oxygen layer in atmosphere

Ozone protects us from the harmful ultraviolent radiations of the sun.

Ozone formula : O3

Explanation

Why lightning comes faster than thunder? 5 marks

Lightning is faster than thunder.

• Lightning and thunder happen at the same time.

• But you see lightning before you hear thunder

• because light, which travels a million times faster than sound, arrives almost instantly.

• Sound, on the other hand, takes about five seconds to travel one mile.

• light at a speed of around 300,000,000 meters per second travels much faster than sound which moves at 340 meters per second.

Explanation

• Tapeworms are a type of parasite that live inside the digestive system of their host organism (such as humans or animals) and feed on the nutrients absorbed by the host.
• They do not contribute to the host's survival or well-being, and can in fact harm the host by competing for nutrients and causing disease.

Explanation

Cigarette smoke and radon are two of the most common indoor hazards.

Most people spend upward of 90% of their time indoors. Without proper ventilation, many pollutants can accumulate indoors.

Explanation

• The old name of Nitrogen is Azote.
• This name, derived from the Greek word "azotikos" meaning "no life".
• It was given because nitrogen gas does not support respiration, making it inert or "lifeless" in this context.

Explanation

Fricatives are the kinds of sounds usually associated with letters such as f, s; v, z, in which the air passes through a narrow constriction that causes the air to flow turbulently and thus create a noisy sound.