Question | Answer |
On the Galapagos Islands, Charles Darwin observed | somewhat similar species to those on the mainland, with traits that suited their particular environments |
The number and location of bones of many fossil vertebrates are similar to living vertebrates. Most biologists explain this fact on the basis of: | a common ancestor |
Biological fitness is the ability of the individual to: | contribute to the gene pool of the next generation |
Vestigial structures | structures that are part of an organism but no longer used, like a tailbone |
Darwin's observation of finches supported the hypothesis that finch species | originated from a common ancestor |
The three-domain system recognizes fundamental differences between two groups of: | prokaryotes |
A genus is composed of a number of related | species |
All organisms in the kingdoms Protista, Plantae, Fungi and Animalia are | eukaryotes |
abiotic | not living |
biotic | living |
An organism's niche | habitat, food sources, way of life |
When one organism captures and feeds on another organism | predation |
A condition in the environment that can restrict a population's growth | limiting factor |
Energy flows | in one direction |
Nutrients | recycle |
The amount of living tissue at each trophic level in an ecosystem | a biomass pyramid |
Process by which bacteria convert nitrogen gas in the air to ammonia | nitrogen fixation |
Repeated movement of water between Earth's surface and the atmosphere | water cycle |
a snake that eats a frog that has eaten an insect that fed on a plant is a | tertiary consumer |
Algae at the beginning of a food chain are | producers |
organisms that obtain nutrients by breaking down wastes and dead organisms | decomposers |
Nitrogen fixation is carried out by | bacteria |
Total variety of living things in the biosphere | biodiversity |