Explanation

Trilobites are an extinct group of marine arthropods that lived during the Paleozoic Era.

They are one of the earliest known groups of arthropods.

Explanation

• Chlorination is the process of adding disinfectants, such as chlorine, to water to kill harmful microorganisms.
• It prevent the spread of waterborne diseases.

Explanation

• Plastic is a synthetic material that is resistant to decomposition and can take hundreds or even thousands of years to break down.
• It is a non-biodegradable material.

The examples of non-biodegradable materials such as:

• Inorganic materials (glass, ceramics, heavy metals)
• Synthetic materials (styrofoam, plastic bags, other plastic things)
• Hazardous materials (detergents, toxic chemicals)
• Industrial waste (empty cans, electricity wires, fused bulbs, broken machine parts)

Explanation

Calcium is crucial for:

• Building and maintaining strong bones and teeth
• Muscle function and contraction
• Nerve function and transmission
• Blood clotting and wound healing

Explanation

Enzymes act as biological catalysts, speeding up chemical reactions in the body without being consumed in the process.

They are essential for various physiological processes, including digestion and metabolism.

Explanation

• The color of a star is primarily determined by its surface temperature.
• Stars come in a range of colors, including red, orange, yellow, white, and blue, which are indicative of their surface temperatures.
• The hotter the star, the bluer it appears, while the cooler the star, the redder it appears.

Explanation

• Herbivores are animals that eat only plants, including leaves, stems, roots, flowers, fruits, and seeds.
• Examples of herbivores include cows, deer, rabbits, and elephants.

Explanation

The primary function of the digestive system is to:

Ingest food: Food is taken into the body through the mouth.

Break down food: Mechanical and chemical processes break down food into smaller molecules that can be absorbed.

Absorb nutrients: The small intestine absorbs nutrients such as carbohydrates, proteins, fats, vitamins, and minerals into the bloodstream.

Eliminate waste: Undigested food and waste products are removed from the body through defecation.

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.
• Only plants: Herbivores (e.g., cows).
• Only animals: Carnivores (e.g., lions).

Explanation

Evolution theory explains that the world and living beings follow a natural order and regularity through gradual changes over time.

It is primarily associated with Charles Darwin, who proposed that species evolve through natural selection.