Question

1. which mineral is essential for oxygen transport in the blood?

a) calcium
b) iron
c) potassium
d) sodium

1. what is the primary function of the digestive system?

a) circulating blood
b) breaking down food
c) exchanging gases
d) producing energy

1. which of the following is a sign of good physical health?

a) frequent illness
b) high energy levels
c) poor sleep quality
d) low stamina

1. what is the role of water in the body?

Explanation:

Question 21:

Iron is a key component of hemoglobin, which is responsible for transporting oxygen in the blood. Calcium is important for bone health, potassium for nerve function, and sodium for fluid balance. So the mineral essential for oxygen transport is Iron.

The digestive system's primary function is to break down food into nutrients that can be absorbed. Circulating blood is the circulatory system's role, exchanging gases is the respiratory system's, and producing energy is a cellular process. So the primary function of the digestive system is breaking down food.

High energy levels indicate good physical health. Frequent illness, poor sleep quality, and low stamina are signs of poor health. So the sign of good physical health is high energy levels.

Answer:

B) Iron

Question 22: