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Explanation

White blood cells (leukocytes) are part of the immune system.

They play a key role in defending the body against infections, diseases, and foreign invaders.

They help maintain overall health.

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

The frog eats the caterpillar (a primary consumer), making the frog a secondary consumer.

It occupies the third trophic level in the food chain: Producer → Primary → Secondary → Tertiary.

Explanation

Peptidoglycan (also known as murein) is a mesh-like polymer that makes up the cell wall of most prokaryotes, especially bacteria.

It provides rigidity and structural support, protecting the cell from osmotic pressure.

Explanation

Both senses detect chemicals—smell through the nose and taste through the tongue.

They work together to enhance flavor perception.

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Explanation