Across
- 3. The variety and variability of life on Earth; a region’s biodiversity is measured at three
- 6. the scientific study of life
- 7. organisms can use
- 9. the nucleic acid that carries hereditary information in its sequence; double helix
- 10. the rate of change in population size, expressed in terms of the increase in population per existing individual; may be calculated by subtracting the population’s per capita death rate from its per capita birth rate
- 11. genetic diversity within species, species diversity, and ecosystem diversity
- 14. a heritable trait that improves an organism’s chances of surviving and producing offspring
- 15. an organism that breaks down decaying organic matter into simpler compounds that
- 16. as a subunit of RNA and as a coenzyme in many reactions;
- 18. a species that has a disproportionately large effect on community structure relative to its abundance
- 20. the cumulative genetic change in a population of organisms from generation to generation; leads to differences among populations and explains the origin of all of the organisms that exist today or have ever existed
- 22. a measure of the number of hydrogen ions in a water- based fluid
- 24. the average number of individuals in a population per unit area
- 26. a nucleotide that consists of an adenine base, a ribose sugar, and three phosphate
- 27. a sampling method in which the number of members of a population occupying a sample area or volume of their range is counted directly in order to estimate the size of the population
- 28. an ecological relationship in which one species captures, kills, and eats another
- 29. an ecological relationship in which two organisms try to obtain the same resource
- 30. an organism that makes its own food from abiotic sources, such as sunlight or inorganic materials
Down
- 1. a close ecological relationship in which one species lives in or on another species in a commensal, mutualistic, or parasitic relationship
- 2. consists of two chains (strands) of deoxyribonucleotides (adenine, guanine,
- 4. over a period of time; exponential growth produces a characteristic J-shaped curve
- 5. a complex system of feeding relationships in an ecosystem
- 6. a substance that accepts hydrogen ions in water
- 8. a method in which a sample group of members of a population are captured and marked; the proportion of marked organisms in a second group, captured at a later time, is used to estimate the size of the population
- 12. an organism that gets its energy and nutrients from eating other organisms
- 13. a factor that limits the possible solutions that could be developed to solve a problem
- 17. the group of organisms in an ecosystem which occupy the same level in a food chain
- 19. a population growth pattern in which a population grows at a constant rate of
- 21. carrier
- 23. a substance that releases hydrogen ions in water
- 25. a standard that an engineering solution must meet to be considered successful