Explanation

Antibodies are proteins produced by the immune system to neutralize or destroy antigens (disease-causing agents).

They are a key part of the body’s defense mechanism against pathogens like bacteria and viruses.

Explanation

Explanation

Frogs can breathe through their skin, lungs, and lining of the mouth, especially in water where cutaneous respiration is key.

This ability helps them absorb oxygen directly from their environment.

Earthworms and amphibians, such as frogs, breathe through their skin. 

Explanation

Tuberculosis (TB) is a bacterial infection caused by Mycobacterium tuberculosis, and its symptoms include:

• Fever
• Chest pain
• Coughing up blood or phlegm
• Sweating at night
• Fatigue
• Weight loss (not weight gain)

Explanation

Eukaryotic cells have a well-defined nucleus enclosed by a nuclear membrane.

Prokaryotic cells lack a nucleus — their DNA floats freely in the cytoplasm.

This is the main difference between the two.

Explanation

• Argon (Ar) is a noble gas that is not typically associated with acid rain.

Acid rain is caused by the presence of pollutants in the air, such as:

• Sulfur dioxide (SO2)
• Nitrogen oxides (NOx)
• Oxygen (O2) plays a role in the formation of acid rain, as it reacts with SO2 and NOx to form acidic compounds.

Explanation

As a raindrop falls:

• Initially, it accelerates due to gravity.

• As its speed increases, air resistance (a drag force) also increases.

• Eventually, a point is reached where the upward air resistance equals the downward gravitational force.

• At this point, net force = 0, so acceleration stops, and the raindrop continues falling at a constant speed.

This constant speed is called terminal velocity.

Explanation

 Aviophobia is the specific fear or anxiety associated with flying in airplanes. 

Explanation

 Brontophobia is the irrational and intense fear of thunder.

 The term comes from the Greek words "bronte" (thunder) and "phobos" (fear). 

Astraphobia, also known as astrapophobia, brontophobia

 Ergophobia: Fear of work

“Heliophobia” is the fear of Sunlight

Cibophobia is the fear of Food

Xenophobia is the fear of Stranger or Foreigner

“Agoraphobia” is the fear of Public Place

“Musophobia” is the fear of Rats

“Achluophobia” is the fear of Darkness

“Dendrophobia” is the fear of Trees

Explanation

In humans and higher animals, the exchange of gases (oxygen and carbon dioxide) is carried out by the respiratory processes, which include:

• Breathing (inhalation and exhalation)
• Transport of gases through the blood
• Exchange of gases in the lungs (oxygen in, carbon dioxide out)