Normal Red Sickle
Blood Cell Red Blood Cell
Sickle cell anemia is passed from parent to offspring. How did a change from the normal red blood cell shape most likely originate?

What percentage of light hits earth's surface directly?

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.

Each hereditary trait corresponds to