Eating Nails for Breakfast: Forces and Interactions for Middle School

Neodymium magnets are a type of rare earth magnet, and they are currently the strongest type of permanent magnet available. Since both terms describe the same high-strength category, C is the correct choice.

Magnets come in a wide variety of strengths depending on their material, size, and composition. Therefore, the statement that they only come in one strength is false.

Hemoglobin is a protein found in red blood cells that carries oxygen throughout the body. It is a vital component of human blood.

Iron is a central component of the hemoglobin molecule, which allows it to bind to oxygen. This is where the majority of the body's iron is utilized.

Iron deficiency leads to anemia, which reduces the blood's ability to transport oxygen. This results in fatigue, weakness, and a compromised immune system.

The human body contains about 3 to 4 grams of iron, which is roughly the amount of iron found in a few small iron nails. This is a common scientific analogy.

The chemical symbol for iron is Fe, which comes from the Latin word ferrum. I is Iodine, Cl is Chlorine, and U is Uranium.

Fortified cereals often contain small particles of elemental iron, which are magnetic. This allows them to be attracted to a strong magnet.

When a magnet picks up iron particles, it is demonstrating an attractive force. The magnet pulls the iron toward it.