A term used to describe any living component of an ecosystem, such as plants, animals, or bacteria.
What is biotic?
These organisms, like fungi and bacteria, get energy by breaking down dead organic matter
What are decomposers?
The process by which populations change over long periods of time.
What is evolution?
The natural differences between individuals of the same species, often caused by genetic mutations.
What is variation?
These two elements are found in a molecule of water
What are hydrogen and oxygen?
This type of organism consumes plants and animals
What is an omnivore?
In an energy pyramid, only about this percentage of energy is passed from one level to the next.
What is 10%
This naturalist is famous for studying finches and tortoises on the Galapagos Islands.
Who is Charles Darwin?
A group of organisms that can mate with each other and produce fertile offspring.
What is a species?
This is an example of a monotreme (an egg-laying mammal)
What is a platypus or echidna?
Group of individuals belonging to the same species living in the same area
What is a population?
Environmental factors like food, water, and space that keep a population from growing forever.
What are limiting factors?
This term describes the most recent individual from which two or more different species are descended.
What is a common ancestor?
This branching diagram shows the evolutionary relationships between different groups of organisms.
What is a phylogenetic/evolutionary tree?
This is the approximate height of Mt.Everest (must get within +/- 5,000 to be correct)
What is ~ 29,000 feet?
This is the specific "job" or role an organism has within its habitat, including what it eats and how it survives.
What is niche?
This occurs when two or more species try to use the same limited resource, like food or space.
What is competition?
Darwin observed that most species produce more offspring than can survive, a concept known as this.
What is overproduction?
Body parts of species that have similar features, indicating a common ancestor
What are homologous structures?
This animal went extinct around the late 17th century

What is the Dodo bird?
This describes the variety of life in an ecosystem; higher levels of it usually mean the ecosystem is more resilient.
What is biodiversity?
This type of species has a massive impact on its ecosystem; if it's removed, the whole system might collapse
What is a keystone species?
When individuals come to a population and introduce new traits
What is gene flow?
When random events change the gene pool of a population
What is genetic drift?
This is the only planet in our solar system that rotates on its side
What is Uranus?