Crossword Puzzle

4. the state or process that occurs when no more of something can be absorbed, combined with, or added.
7. completely cover or obscure.
9. the action of driving or pushing forward.
12. including or covering everything or everyone; comprehensive.
13. a red protein responsible for transporting oxygen in the blood of vertebrates. Its molecule comprises four subunits, each containing an iron atom bound to a heme group.
15. relating to biology or living organisms
16. an act of retiring or giving up a position.
17. relating to or deriving from the metabolism of a living organism.
19. deficiency in the amount of oxygen reaching the tissues.
20. relating to genes or heredity.

1. of or involving a gas at a pressure greater than normal.
2. reduction in air pressure.
3. occurring through divine or supernatural intervention, or manifesting such power.
5. relating to or denoting a mammal.
6. relating to or situated on the edge or periphery of something.
8. the disordered physiological processes associated with disease or injury.
10. respond physiologically or behaviorally to a change in conditions in the natural environment.
11. relating to or affecting the navel or umbilical cord.
14. expressed clearly; easy to understand.
18. with decisive or vital importance.