Question

read the passage.
two kinds of iron
the human body needs iron to produce hemoglobin, a substance that helps red blood cells transport oxygen. without enough iron, a person may feel tired and weak. dietary sources of iron include plant sources, such as vegetables and beans, and animal foods, including poultry, red meat, and fish. however, plant and animal sources are not equal. the iron in plants, called nonheme iron, is not easily absorbed by the human digestive system. for example, a half cup of cooked spinach contains a healthy dose of over three milligrams of iron. unfortunately, only five percent of that iron can be used by the body. on the other hand, the iron in animal foods, called heme iron, is better utilized. heme iron is contained within a ring of protein, which helps the body to absorb it easily.
what is the main, or central, idea of the passage?
heme iron, found in meat and fish, is easily absorbed by the human body.
plant and animal food sources both contain iron, but the iron in animal foods is more accessible to the body.
plant and animal food sources both contain iron, which helps red blood cells carry oxygen throughout the body.

Explanation:

Breve explicación:

El pasaje habla sobre las dos fuentes de hierro en la dieta (plantas y alimentos de origen animal), y destaca que el hierro en los alimentos de origen animal (hierro hemo) es más fácilmente absorbido por el cuerpo que el hierro en las plantas (hierro no hemo).

Respuesta:

Plant and animal food sources both contain iron, but the iron in animal foods is more accessible to the body.

Answer:

Breve explicación:

El pasaje habla sobre las dos fuentes de hierro en la dieta (plantas y alimentos de origen animal), y destaca que el hierro en los alimentos de origen animal (hierro hemo) es más fácilmente absorbido por el cuerpo que el hierro en las plantas (hierro no hemo).

Respuesta:

Plant and animal food sources both contain iron, but the iron in animal foods is more accessible to the body.