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Answer Key
Grade 8 Science: Ecosystem Dynamics, Stability & Change
1.
a community of living things interacting with each other and their nonliving environment
2.
tendency of an ecosystem to maintain structure and function over time despite small changes
3.
an event or change that disturbs populations, habitats, or interactions
4.
how population sizes change over time due to births, deaths, immigration, and emigration
5.
the approximate maximum population an environment can support long-term
6.
Answers vary: food, water, space, disease, predators
7.
a chain of effects when a change in one species or factor ripples through the ecosystem
8.
prey may increase, which can then affect plants or other species (cascade awareness)
9.
maintaining structure/function despite small changes
10.
event/change disturbing populations or interactions
11.
how population sizes change over time
12.
max population environment can support long-term
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