Explanation

Red phosphorus is the form of phosphorus used in safety matches.

It's found on the striking surface of the matchbox, not in the match head itself.

This design separation prevents the match from spontaneously igniting. 

Explanation

Svedberg (Sv):

A unit measuring the sedimentation coefficient (how fast particles settle in a centrifuge).

Used in ultracentrifugation to study macromolecules (e.g., proteins, ribosomes).

1 Sv = 10⁻¹³ seconds.

Explanation

Natural Sources of Vitamin D:

Fatty Fish: Salmon, mackerel (richest sources).

Animal Products: Egg yolks, liver, butter, and fortified dairy.

Explanation

 Bamboo is the fastest-growing plant in the world. 

Some species can grow up to 91 cm (about 35 inches) in a single day under optimal conditions

Most  eucalyptus trees grow much faster than other trees

Some eucalyptus species can grow 6 to 12 feet per year. 

Explanation

Bromine is one of the only two elements (along with mercury) that are liquid at room temperature.

The others listed are solid or gas under normal conditions.

Explanation

Explanation

 Copper was first used by man over 10,000 years ago

The period following the use of copper is sometimes referred to as the Copper Age or Chalcolithic Age. 

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

Hydrogen and helium are the two lightest gases, both significantly lighter than air. 

Hydrogen: Considered the lightest gas.

Helium: Also lighter than air, but twice as heavy as hydrogen.

Air: Has a higher molecular weight than both hydrogen and helium. 

Explanation

The plants and vegetation of a region are collectively known as flora.

Flora refers to the plant life occurring in a particular region or time.