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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.

List five ways we are indebted to phytoplankton

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million