Explanation

Evaporation is the process where liquid water turns into water vapour due to heat.

It is a key part of the water cycle, occurring from surfaces like oceans, lakes, and soil.

Explanation

The process where plants use sunlight to create their food is called photosynthesis.

During photosynthesis, plants convert light energy, water, and carbon dioxide into glucose, a sugar they use for energy, and oxygen, which is released into the atmosphere

Explanation

The function of kidneys is to remove toxins or waste products from your blood.

Kidneys keep the right amount of water in the body.

Your kidneys also help control your blood pressure.

Explanation

According to Coulomb’s Law, force is inversely proportional to the square of distance: F∝ 1/r².

So, if distance is doubled, force becomes 1/(2)² = 1/2.

Explanation

• Marker of bone formation are Osteocalcin
• Bone Markers are Blood and Urine tests that detect products of bones.
• Osteocalcin is a protein that helps to regenerate bone tissue.
• All are important markers of bone formation except hydroxyproline which is a marker for wound healing.
  

Explanation

Pressure is typically measured in units of force per unit area.

In the Imperial system, pressure is commonly measured in Pounds per Square Inch (PSI).

This is a widely used unit of pressure in engineering, physics, and many other fields.

Other common units of pressure include:

• Atmospheres (atm)
• Bars
• Pascals (Pa)
• Torr

Explanation

A galaxy is a gravitational system of stars, star remnants, interstellar gas, dust, and dark matter.

Earth: diameter of approximately 12,742 kilometers (7,918 miles)

The Sun: diameter of approximately 1,392,684 kilometers (865,374 miles)

Solar System: diameter of approximately 9.2 billion kilometers (5.7 billion miles)

Galaxy (Milky Way): diameter of approximately 100,000 to 200,000 light-years (9.461 × 10^17 to 1.884 × 10^18 kilometers)

Explanation

HIV (Human Immunodeficiency Virus) is not transmitted through saliva.

The virus cannot be spread through casual contact like kissing, sharing utensils, or exposure to saliva.

The primary modes of HIV transmission are:

• Surgical instruments (if contaminated with infected blood and not properly sterilized).
• Semen (during sexual contact or other exposure to genital fluids).
• Sexual contact (unprotected anal, vaginal, or oral sex).

Saliva contains enzymes and inhibitors that make HIV transmission highly unlikely, even in deep kissing.

Explanation

Darwin's theory of natural selection is based on the following key principles:

• Overproduction: Organisms produce more offspring than can survive.
• Struggle for survival: Resources are limited, leading to competition among individuals.
• Survival of the fittest: Individuals with advantageous traits are more likely to survive and reproduce.

These elements collectively explain how species evolve over time through natural selection.

Explanation

The head of arthropods bears the brain (ganglia), compound eyes, and antennae for sensing.

These structures help in coordination, vision, and environmental detection.