Science

1. Band of colors produced when light is dispersed.
7. Deoxyribonucleic acid, carrier of genetic information.
8. Subatomic particle with a positive charge.
11. Basic unit of the nervous system.
12. The global ecological system integrating all living beings and their relationships.
13. Unit of heredity that is transferred from a parent to offspring.
16. Branch of physical science dealing with the relations between heat and other forms of energy.
18. The speed of something in a given direction.
19. Closed loop through which electricity can flow.
20. Process that involves rearrangement of the molecular or ionic structure of a substance.

2. Process by which plants convert light energy into chemical energy.
3. Organelle known as the "powerhouse" of the cell.
4. Smallest unit of matter that retains an element's chemical identity.
5. Distance between successive crests of a wave.
6. Force attracting any objects with mass.
9. Element essential for respiration.
10. (Humorous, self-referential) A mythical bird that rises from ashes, like a program restarting.
14. Negatively charged subatomic particle.
15. Community of living organisms in conjunction with the nonliving components of their environment.
17. A measure of the size or extent of something, like an earthquake.