What is the main purpose of the digestive system?

• To circulate blood

• To break down food for nutrients

• To control body movement

• To produce oxygen

Which of the following is a homogeneous mixture?

• Sand and water

• Oil and water

• Salt and water

• Pebbles and stones

Which of these materials is harmful to the environment?

• Banana peel

• Plastic bag

• Paper

• Cotton fabric

Which body system includes the heart and blood vessels?

• Respiratory system

• Circulatory system

• Digestive system

• Skeletal system

Which of the following is an invertebrate?

• Dog

• Cat

• Earthworm

• Monkey

Which gas do humans inhale to survive?

• Oxygen

• Carbon dioxide

• Nitrogen

• Hydrogen

What is the largest planet in the solar system?

• Mars

• Earth

• Jupiter

• Venus

Which part of the plant is responsible for photosynthesis?

• Root

• Stem

• Leaf

• Flower

Which of the following best describes a homogeneous mixture?

• A mixture where you can see the individual substances

• A mixture that looks the same throughout

• A mixture that cannot be separated

• A mixture with large visible particles

What process separates salt from seawater?