Explanation

Gastric juice, containing hydrochloric acid and digestive enzymes.

It is secreted by the glands in the stomach to aid in food digestion.

Explanation

Scorpions and spiders both belong to the class Arachnida.

This class includes arachnids, which are characterized by having eight legs and lacking antennae.

Explanation

Heinrich Rudolf Hertz discovered electromagnetic waves in 1887, experimentally confirming James Clerk Maxwell's predictions.

Hertz demonstrated the existence of radio waves, a type of electromagnetic wave, using a simple apparatus.

Explanation

Work is done only when a force produces displacement.

Since the wall does not move, displacement = 0 → Work = 0.

Explanation

For equal distances, average speed = harmonic mean = 2𝑎𝑏/𝑎+𝑏 = 2⋅40⋅60/40+60 = 48.

Not the arithmetic mean (which would be 50) because travel times differ.

Explanation

Explanation

Explanation

The Watson-Crick model suggested that DNA replication is semi-conservative,

Meaning that each original DNA strand serves as a template to synthesize a new complementary strand,

This results in two DNA molecules, each containing one original strand and one newly synthesized strand. 

Explanation

• The oesophagus is a muscular tube that connects the pharynx (throat) to the stomach.
• Its main function is to transport food from the pharynx to the stomach through peristalsis (wave-like muscle contractions).

Explanation

Evaporation is the process where liquid turns into gas at temperatures below its boiling point.

It occurs at the surface of the liquid.

It is influenced by factors like temperature and surface area.