Write the letter of the matching definition next to each term.
1. biosphere
A. A system formed by the interaction of a community of organisms with their physical environment
2. species
B. The responsive adjustment of a sense organ to varying conditions
3. biology
C. A collection of facts from which conclusions may be drawn
4. organism
D. Coins collectively (plural)
5. cell
E. A segment of DNA that is involved in producing a polypeptide chain
6. metabolism
F. The sequence of events involved in the ___ development of a species or taxonomic group
7. DNA
G. Magnifier of the image of small objects
8. system
H. A long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like
9. ecosystem
I. A number representing a quantity assumed to have a fixed value in a specified mathematical context
10. homeostasis
J. A writer or artist who sells services to different employers without a long-term contract with any
11. evolution
K. The marked and rapid transformation of a larva into an adult that occurs in some animals
12. adaptation
L. Characteristic life processes and phenomena of living organisms
13. observation
M. Metabolic equilibrium actively maintained by several complex biological mechanisms that operate via
14. data
N. Something that is likely to vary
15. hypothesis
O. The act of conducting a controlled test or investigation
16. experiment
P. The branch of biology that studies heredity and variation in organisms
17. variable
Q. Tiniest unit of living things
18. constant
R. The act of making and recording a measurement
19. theory
S. Instrumentality that combines interrelated interacting artifacts designed to work as a coherent
20. microscope
T. A person who relies on another person for support
21. gene
U. A well-substantiated explanation of some aspect of the natural world
22. independent
V. The regions of the surface and atmosphere of the Earth where living organisms exist
23. dependent
W. A system considered analogous in structure or function to a living body
24. genetics
X. A proposal intended to explain certain facts or observations