the number and relative abundance of species in a biological community
the diversity of plant and animal life in a particular habitat (or in the world as a whole)
large regions such as forests, deserts, and grasslands, with distinct climates and certain species (especially vegetation) adapted to them.
the process whereby earth's life changes over time through changes in the genetic characteristics of populations
The process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species
Random errors in gene replication that lead to a change in the sequence of nucleotides; the source of all genetic diversity
inherited characteristic that increases an organism's chance of survival
the number of different species in a community
relative abundance of individuals within each each of the species in a community.
A specific role of a species within an ecosystem, including its use of resources, and relationships with other species.
Generalist species have broad niches. They can live in many different places, eat a variety of foods, and often tolerate a wide range of environmental conditions.
Species with a narrow ecological niche. They may be able to live in only one type of habitat, tolerate only a narrow range of climatic and other environmental conditions, or use only one type or a few types of food.
Species that normally live and thrive in a particular ecosystem.
Species that migrate into an ecosystem or are deliberately or accidentally introduced into an ecosystem by humans.
species that serve as early warnings that an ecosystem is being damaged.
a species whose impact on its community or ecosystem are much larger and more influential than would be expected from mere abundance
species that play a major role in shaping communities by creating and enhancing their habitats in ways that benefit other species