Explanation

Explanation

• Charles' Law states that the volume of a fixed amount of gas is directly proportional to its absolute temperature when pressure remains constant.
• The formula is V1 / T1 = V2 / T2, where temperature is measured in Kelvin.
• When the temperature increases, the gas volume increases; when the temperature decreases, the volume decreases, provided the pressure remains constant.

Last verified on 28-10-2026

Explanation

• Monotremes are mammals that lay eggs instead of giving birth to live young.
• The platypus and echidnas are the only living groups of monotremes.
• Placentals develop their young inside the uterus with the help of a placenta.
• Marsupials usually give birth to underdeveloped young that continue developing in a pouch.
• Cetacea includes whales, dolphins, and porpoises.

Last verified on 27-10-2026

Explanation

• The fourth ventricle is a fluid-filled cavity located in the hindbrain, between the brainstem and cerebellum.
• It lies behind the pons and upper medulla oblongata and in front of the cerebellum.
• It is continuous with the cerebral aqueduct above and the central canal of the spinal cord below.

Last verified on 27-10-2026

Explanation

• The biceps brachii contracts to bend the elbow joint, a movement called flexion.
• The triceps brachii performs the opposite movement, extending or straightening the elbow.
• The biceps and triceps work as an antagonistic pair: when one contracts, the other generally relaxes to allow movement.

Last verified on 27-10-2026