Explanation

• Myocardial Infarction (MI) is the scientific term for a heart attack.
• It occurs when the blood flow to the heart is blocked, causing damage to the heart muscle.

Explanation

The correct answer is: No change in composition

• A chemical change involves a transformation of one or more substances into new substances, which means a change in composition.

The signs of chemical change:

• Release of gas
• Change in color
• Change in temperature
• Change in smell
• Production of a new material

Explanation

The atomic mass (A) is the sum of protons and neutrons in the nucleus. In this case:

• Protons (Z) = 11
• Neutrons (N) = 12
• Atomic Mass (A) = Z + N = 11 + 12 = 23

Explanation

• A land with high rainfall, typically between 250 to 450 mm annually, is a forest.
• Forests are areas with high vegetation density, and the abundant rainfall supports the growth of a diverse range of plant and tree species.

Explanation

• During swallowing, the epiglottis closes to cover the larynx (voice box).
• It preventing food and liquids from entering the trachea (windpipe).
• It directing them into the esophagus instead.

Explanation

• When fuel is burned, carbon dioxide gas (CO₂) is primarily produced.
• The combustion of fuel, particularly hydrocarbons, typically results in the formation of carbon dioxide and water vapor (H₂O).

Explanation

• The circulation of blood starts from the right side of the heart.
• Specifically from the right ventricle, which pumps blood into the pulmonary artery and sends it to the lungs to pick up oxygen.

Explanation

• A constellation is a group of stars that, when viewed from Earth, form a pattern or shape that is recognizable.
• It has been given a specific name, such as Orion, Cassiopeia, or Ursa Major.

Explanation

• The hottest stars are the blue stars, and their temperature is around 25,000°C.
• These stars emit blue light due to their extremely high surface temperatures, which can range from 20,000 to over 30,000 degrees Celsius.

Explanation

• The color of an opaque or non-luminous object is the color of light it reflects.
• When light hits the object, some wavelengths are absorbed, and the remaining wavelengths are reflected, which is what we perceive as the object's color.