Explanation

• Reproduction is the process by which living organisms increase their numbers.
• Either sexually or asexually, to produce offspring and ensure the continuation of their species.

Explanation

• Aerobic respiration is the process of cellular respiration that uses oxygen (O2) to generate energy from glucose.
• It is the primary method of energy production in humans and other animals, and it produces carbon dioxide and water as byproducts.

Explanation

• Red stars, also known as red dwarfs, typically have a surface temperature around 3000°C (5400°F).
• This is the coolest temperature range for stars, and it's what gives them their distinctive red color.

Explanation

• Dolphins have a wide audible range that is adapted to their aquatic environment.
• They can hear sounds in the range of 20 Hz to 120,000 Hz, which is far beyond the human audible range.

Explanation

• When two bulbs are connected in a series circuit and one bulb blows, the entire circuit is interrupted, and the other bulb will also stop glowing, i.e., also blow (blast).
• This is because there is no longer a complete path for current to flow through the circuit.

Explanation

• Binoculars typically use Porro prisms, which are a type of reflecting prism that uses total internal reflection to redirect light.
• Porro prisms are named after their inventor, Ignazio Porro, and are widely used in binoculars and other optical instruments.

Explanation

• A release of gas is typically a sign of a chemical change, not a physical change.

The signs of physical change:

• Change that can be reversed
• The substance does not turn into a new substance

Explanation

• About 97.5% of the water on Earth is saltwater, found in oceans, seas, and salt lakes.
• The remaining 2.5% is freshwater, found in rivers, lakes, wetlands, and underground aquifers.

Explanation

Tundra is a region with a very cold climate, found in the Arctic and Antarctic regions, characterized by:

• Low temperatures
• Short growing season
• Limited vegetation (mainly low-growing shrubs, grasses, and mosses)
• Permafrost (frozen soil)

Explanation

• The oesophagus (also known as the esophagus) is a muscular tube that acts as a pathway to transport food from the pharynx (throat) to the stomach.
• It uses peristalsis (wave-like muscle contractions) to move the food bolus into the stomach.