Measles is a highly contagious viral infection spread through respiratory droplets.

Homo sapiens is the binomial name for modern humans.

The iris regulates the pupil size to control light entry.

Hemoglobin binds oxygen in red blood cells and delivers it to tissues.

Skin is an epithelial tissue, not connective.

Common salt is sodium chloride (NaCl), essential for human health and widely used in food preservation.

Kidneys filter waste from the blood and regulate water and salt balance, playing a crucial role in homeostasis.

The Earth rotates on its axis, resulting in the alternation of daylight and darkness every 24 hours.

The human heart has 2 atria and 2 ventricles for efficient oxygenation and circulation.

Salivary amylase (ptyalin) begins the digestion of starch into sugars.

A slightly alkaline pH of 7.35–7.45 is essential for normal physiological functions.

Plants release oxygen as a by-product of converting CO₂ and water into glucose.

Nitrogen makes up about 78% of Earth’s atmosphere and is vital for plant growth through the nitrogen cycle.

Iodine deficiency leads to thyroid gland enlargement, known as goitre.

Leaves contain chlorophyll, which captures sunlight to convert carbon dioxide and water into glucose and oxygen.

Skin covers and protects the body, making it the largest organ by surface area.

Xylem carries water and minerals from roots to other parts of the plant.

The cerebellum manages posture, balance, and coordinated movements.

A gene is a segment of DNA that codes for traits.

It produces energy (ATP) through cellular respiration.