A living component of an ecosystem; for example organisms, such as plants and animals.
Group of organisms that can reproduce naturally with one another and create fertile offspring.
Each of a number of small areas of habitat, typically of one square meter, selected at random to act as samples for assessing the local distribution of plants or animals.
An ecological relationship between two species that live in close proximity to each other.
A person or an animal that hunts a smaller weaker person or animal.
The binomial name given to a particular species.
Organism that feeds on plant material.
A large area of land that is classified based on the climate, plants and animals that make their homes there. For example, land-based ________ are terrestrial ________, and water-based _______ are called aquatic _______.
Organism that consumes mostly meat, or the flesh of animals.
The development of changes that can be passed genetically over the history of an organism.
Protects the environment from harmful human activities.
Group of individuals of the same species living in a given area or habitat at a given time.
The adjustment of organisms to their environment in order to improve their chances at survival in that environment.
A species that originated somewhere other than its current location and has been introduced to the area where it now lives
Any kind of green plant. Green plants make their food by taking sunlight and using the energy to make sugar.
A line across a habitat or part of a habitat. It can be as simple as a string or rope placed in a line on the ground. The number of organisms of each species along a transect can be observed and recorded at regular intervals.
An organism that is not indigenous, or native, to a particular area.