Aflu vaccine is needed seasonally to be effective but a polio vaccine is only needed once. the best explanation of this is

Body systems are not completely independent they integrate and work together describe one example of the integration between body systems

Identify the examples in which sam interacts only with natural resources

What is the main function of the central vacuole in a plant cell? a. absorbs energy from the sun to produce food b. holds water and maintains turgor pressure c. breaks down molecules to release energy d. contains the cell's genetic material