Explanation

A geostationary satellite orbits the Earth at a speed that matches the Earth's rotation, staying fixed above the same point on the Earth's surface.

This allows it to maintain a constant position relative to the Earth.

Explanation

Insulin production through modern biotechnology involves using genetically modified organisms to produce insulin for treating diabetes.

This method has revolutionized the treatment of diabetes, providing a reliable and abundant supply of insulin.

Explanation

Vertical angles are equal. Given:

80° = 4x

Divide both sides by 4:

x = 80° / 4

x = 20°

Explanation

Area of a pizza (circle) = π × r², where r = b

With crust thickness a, and using π ≈ n,

Value (volume-like expression) becomes:

n × b² × a = nb²a

Explanation

The cells in the nasal chamber, specifically the olfactory cells, detect smell.

These sensory cells send signals to the brain to process different odors.

Explanation

An aerosol is a colloidal suspension of liquid droplets in a gas, commonly air.

Examples include fog, mist, and spray deodorants.

Explanation

Genes are units of heredity located on chromosomes that control the traits passed from parents to offspring.

They determine physical and biochemical characteristics in all living organisms.

Explanation

Radiation transfers heat through electromagnetic waves and does not require a medium.

For example, the Sun's heat reaches Earth through radiation.

Explanation

Given frequencies:

10–20 → 12

20–30 → 18

30–40 → 10

40–50 → 5

50–60 → 2

The minimum frequency is 2, which corresponds to class 50–60.

Explanation

An electrolytic cell uses electric current to drive a chemical reaction (usually decomposition).

This process is called electrolysis, clearly representing the chemical effect of current.