(21) cartilaginous fish; mouth on ventral side; hundreds of teeth arranged in adjoining circular rows; enlarged caudal fin for fast swimming

How do adaptation affect a species?

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.

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?