Explanation

• Air is a mixture of different gases.
• Primarily consisting of nitrogen (78%), oxygen (21%), and trace amounts of other gases.

Explanation

A solar eclipse can only take place during the phase of the new moon

when the moon passes directly between the sun and Earth and its shadows fall upon Earth's surface.

Explanation

• Omnivores are animals that eat both plants and animals.
• They have adaptations that allow them to digest and extract nutrients from a wide variety of food sources, including fruits, leaves, insects, small animals, and even carrion.
• Examples of omnivores include humans, bears, pigs, chimpanzees, and raccoons.

Explanation

Entomology is the study of insects and their relationship to humans, the environment, and other organisms.

while

Zoology is the study of all animals.

Biology is a natural science concerned with the study of life and living organisms.

Etymology investigates and documents the lives.

Explanation

• The SI unit of force is the newton (N).
• 1 N = the force needed to accelerate 1 kg of mass by 1 m/s²
• Derived unit: N = kg·m/s²
• Named after Sir Isaac Newton
• Based on F = ma (Newton's second law)

The base units relevant to force are:

1. The metre, unit of length — symbol m
2. The kilogram, unit of mass — symbol kg
3. The second, unit of time — symbol s

Explanation

Explanation

The chemical formula of baking soda is NaHCO₃, which stands for sodium bicarbonate.

The chemical name of baking soda is sodium hydrogen carbonate or sodium bicarbonate (NaHCO3).

Sodium bicarbonate is non flammable

Baking soda is basic in nature.

Explanation

White Blood Cells (WBCs), also known as leukocytes, are a vital part of the immune system.

They protect the body from infectious diseases and foreign invaders by identifying and eliminating pathogens.

Such as bacteria, viruses, and other foreign substances.

Explanation

Demography is the statistical study of the human population,

Including aspects such as size, structure, distribution, and dynamics.

It examines factors like birth and death rates, migration, age, sex, and occupation, among others.

انسانی آبادی کا شماریاتی مطالعہ ڈیموگرافی کہلاتا ہے۔

Explanation

Goiter is caused by iodine deficiency.

It results in an enlarged thyroid gland.

Iodine deficiency can cause mental retardation in children.

Particularly if the deficiency occurs during fetal development or early childhood.

This is because iodine is essential for brain development and thyroid function.

The effects of the thyroid come from two iodine-containing hormones.