Explanation

 A healthy heart beats around 72 times per minute, which translates to roughly 100,000 beats per day. 

Explanation

 The eustachian tube is not part of the inner ear; the inner ear consists of the cochlea, semicircular canals, and the vestibule (which includes the utricle and saccule). 

Explanation

 Anaerobic Organisms: Anaerobic organisms, including certain bacteria, are those that do not require oxygen for growth and survival. 

Oxygen Toxicity: Some anaerobic bacteria are highly sensitive to oxygen and cannot tolerate its presence, while others can tolerate small amounts of oxygen. 

Explanation

 Ligaments are tough, fibrous bands of connective tissue that connect bone to bone, primarily around joints, helping to stabilize them and limit excessive movement. 

Explanation

 The unit "poise" (symbolized as P) is a CGS (centimeter-gram-second) unit of dynamic viscosity,

It also known as absolute viscosity, named after French physician Jean Louis Marie Poiseuille. 

Explanation

The respiratory center, responsible for controlling breathing, is primarily located in the medulla oblongata and pons within the brainstem. 

Explanation

 Ice blocks are covered with sawdust primarily to provide necessary insulation from heat, preventing them from melting quickly. 

Explanation

The reason is that the rails expand in summer

. The gap is provided to allow for this expansion.

If no gap is left the expansion in summer will cause the rails to bend sideways

This may result in train accidents.

Explanation

 "Meter per second" (m/s) is the standard unit of speed and velocity,

Indicating the distance traveled in meters throughout one second.

It measures how fast something moves (speed) and in what direction (velocity). 

Speed:

Speed is a scalar quantity, meaning it only describes the magnitude (how fast) of an object's movement, measured in meters per second. 

Velocity:

Velocity is a vector quantity, meaning it describes both the magnitude (how fast) and direction of an object's movement, also measured in meters per second. 

Explanation

Work done by 12 men in 4 days = 1 (full work)

Work done by 1 man in 4 days = 1/12

Work done by 6 men in 4 days = 6/12 = 1/2 (i.e., half of the work)

Work done by 6 men in 2 days = (1/2) × (2/4) = 1/4

Remaining work = 1 - 1/4 = 3/4

15 women complete the full work in 4 days → 1 woman’s 1-day work = 1/(15 × 4) = 1/60

Work needed in 3 days → x women × 3 × (1/60) = 3/4

x = (3/4) × (60/3) = 15 women