Across
2. The ability of organisms to change over time
3. A signal to which an organism responds
5. A device that produces magnified images of
structures that are too small to see with the unaided eye
6. A well-tested explanation that unifies a broad range of
observations
8. A decimal system of measurement whose units are
scaled on multiples of 10
13. It allows light to pass through the specimen and
uses two lenses to form an image
15. A logical interpretation based on prior knowledge or
experience
16. Where the single cell is able to reproduce so that a
group of cells develop from the single cell
17. The process of gathering information about events
18. The information gathered from observations
19. Involves internal feedback mechanisms that work in
much the same way as a thermostat
20. A technique used to separate the cell into different
parts
21. Where life can arise from nonliving matter
22. The new organism has a single parent
23. The variable that is deliberately changed
Chapter 1 Vocabulary
Down
1. Cells from two different parents unite to produce the first cell of the new
organism
4. It uses beams of electrons, rather than light, to produce images
7. The variable that is observed and that changes in response to the
manipulated variable
8. The combination of chemical reactions through which an organism builds
up or breaks down materials as it carries out its life processes
9. The study of the living world
10. A proposed scientific explanation for a set of observations
11. An organized way of using evidence to learn about the natural world
12. A collection of living matter enclosed by a barrier that separates the cell
from its surroundings
14. Variables in an experiment that are left unchanged
NOTE: many of the clues are
answered in 2 words!