Aseed plant is held in the ground by its. a. stems. b. roots. c. leaves. d. epidermis.

The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.

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Match each symbol with its description.