Explanation

• Tertiary consumers are animals that eat primary and secondary consumers.
• They are typically apex predators that have no natural predators in the wild and are at the top of their food chain.
• Examples of tertiary consumers include lions, sharks, bears, and humans.

Explanation

Iodine is involved in the formation of thyroid hormones (triiodothyronine (T3) and thyroxine (T4)) produced by the thyroid gland.

Iodine is essential for the production of thyroid hormones, which are necessary for:

• Energy production
• Regulation of metabolic rate
• Growth and development
• Nervous system function

Explanation

• The air you breathe in enters the lungs through the windpipe (trachea).
• The trachea is a tube that connects the throat (pharynx) to the lungs, allowing air to pass through during breathing.

Explanation

• Humans have 20 primary teeth (also known as deciduous or baby teeth).
• 32 permanent teeth (also known as adult teeth).

Explanation

• An iron nail/steel rod can be magnetized by passing an electric current around it, a process known as electromagnetic induction.
• This is the principle behind electromagnets.

Explanation

• Lever, pulley, wedge, wheel, inclined plane, and screw are examples of simple machines.
• These are basic machines that change the direction or magnitude of a force, making it easier to lift, move, or apply force to an object.

There are six types of simple machines:

1. Inclined Plane
2. Lever
3. Wheel and Axle
4. Pulley
5. Wedge
6. Screw

Explanation

In the Fahrenheit scale:

• The freezing point of water is 32°F
• The boiling point of water is 212°F

Explanation

• Filtration is the process of separating an insoluble solid from a liquid by passing the mixture through a filter paper or a porous material.
• The solid particles are retained by the filter.
• While the liquid passes through, resulting in a clear separation of the two.

Explanation

• Decantation is the process of carefully pouring a liquid from one container to another, leaving the solid particles that have settled at the bottom of the original container behind.
• This process is used to separate a liquid from a solid, without disturbing the solid.

Explanation

• Solids like sand remain suspended in water because they are denser than water.
• But not dense enough to sink to the bottom immediately.
• This creates a heterogeneous mixture, where the sand particles remain suspended in the water.