After soil is established, larger plants can grow and larger _________________ species can arrive.
When few, if any, living things exist in an area, _______________________will establish a first community.
New ____________________ begin to grow in the soil.
Ecosystems change over time. People cause some of the changes, through pollution, __________________ destruction, or hunting, or by introducing or removing ______________.
The first organisms to live in the area are called ________________ species.
Weeds, then shrubs, and finally ___________________ grow.
When land is burned by a fire, or a farm field is abandoned, ________________ occurs.
Succession that occurs where there is no soil and where few, if any, living things exist is __________.
In the final stages of succession, a(n) ___________ develops.
The process of one ecosystem gradually changing into a different type of ecosystem is called _____________.
When a species dies out completely, the species is _____________.
One of the first species to live in an area that used to be lifeless is a(n) ______________.
A species that is in danger of becoming extinct is a(n) ______________.
The establishment of a new community where a community had already existed is called ___________.
Establishment of the first living community to develop in an area that used to be lifeless is called ____________.
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