Crossword Puzzle

2. completely cover or obscure.
4. relating to or deriving from the metabolism of a living organism.
10. occurring through divine or supernatural intervention, or manifesting such power.
13. including or covering everything or everyone; comprehensive.
15. the state or process that occurs when no more of something can be absorbed, combined with, or added.
16. expressed clearly; easy to understand.
17. 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.
19. with decisive or vital importance.
20. deficiency in the amount of oxygen reaching the tissues.

1. relating to genes or heredity.
3. relating to or affecting the navel or umbilical cord.
5. relating to biology or living organisms
6. of or involving a gas at a pressure greater than normal.
7. the disordered physiological processes associated with disease or injury.
8. respond physiologically or behaviorally to a change in conditions in the natural environment.
9. the action of driving or pushing forward.
11. an act of retiring or giving up a position.
12. reduction in air pressure.
14. relating to or situated on the edge or periphery of something.
18. relating to or denoting a mammal.