Explanation

Carbohydrates, specifically starch, are used as a primary fuel source in the human body alongside fats.

They are broken down into glucose, which provides energy for bodily functions and activities.

Explanation

A colour service provides postal-like services, handling letters and parcels.

It operates similar to postal systems but may differ slightly in method or appearance.

Explanation

Lungs remove carbon dioxide, a waste product of cellular respiration.

It is carried by the blood to the lungs and exhaled out of the body.

Explanation

Beneficial bacteria in the large intestine, especially E. coli, help synthesize Vitamin K.

This vitamin is essential for blood clotting and maintaining bone health.

Explanation

Vaccination involves introducing weakened or dead forms of pathogens into the body.

This helps the immune system recognize and fight the real pathogen in the future.

Explanation

The atomic mass of aluminum (Al) is 26.98, which is approximately 27.

This is the most common isotope of aluminum, which has an atomic number of 13.

Explanation

In an electrochemical cell, the anode is the positively charged electrode.

Anions (negatively charged ions) move towards the anode because opposite charges attract.

Explanation

Lemon juice is acidic due to citric acid, giving it a pH between 2 and 3.

Any substance with a pH below 7 is considered acidic.

Explanation

The Exosphere is the outermost layer of Earth's atmosphere.

It extends from about 500 km to 10,000 km above Earth.

This layer gradually transitions into space and contains very few air molecules.

Explanation

Bacteria decompose organic matter from dead plants and animals, recycling nutrients back into the environment.

This process is essential for maintaining soil fertility and ecosystem balance.