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Which of these is a physical change that happens during digestion?
The mouth mashes food
The liver and pancreas break down food
Enzymes in saliva break food down
Stomach acid breaks down food
Which of these is not part of the circulatory system?
Heart
Lungs
Veins
Arteries
What are the tiny air sacs in your lungs called?
Bronchioles
Trachea
Alveoli
Pharynx
What type of muscle is the heart made out of?
Rough muscle
Smooth muscle
Cardiac muscle
Long muscle
Leaves are composed of vascular tissue that brings water in so that ground tissue can conduct photosynthesis. Based on this information, what level of organization describes leaves?
Organ
Organ system
Organism
Tissue
