The Body's Delivery Systems (Discovery Works)

Unit F in the Silver Burdett Ginn Science program, Discovery Works, for 4th grade. The first section is made up of activities in which the students investigate What happens when they breathe?, How does the respiratory system work?, How does blood flow through your body?, How does your body get rid of wastes?,How do diseases spread?, What are harmful and helpful drugs? The second section teaches the use of science tools, measurement methods, etc.