How Ecosystems Change

Question 1

keystone species

Answer 1

a species whose very presence contributes to an ecosystems diversity and whose extinction would consequently lead to the extinction of other forms of life

Question 2

indicator species

Answer 2

species that are used as as a standard to evaluate the health of an ecosystem

Question 3

indigenous species

Answer 3

species that originate and live, or occur naturally, in an area or environment

Question 4

invasive species

Answer 4

introduced, non-native species

Question 5

secondary succession

Answer 5

ecological succession that takes place where an existing community has been cleared (by disturbance events such as fire,tornado, or human impact), but the soil has been left intact

Question 6

ecological succession

Answer 6

that transition in species composition of a biological community often following ecological disturbance of the community, the establishment of a biological community in any area virtually barren of life