Grade 4 Life Science - Changes to Ecosystems
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when two or more species fight for the same limited resources (food, water, space, shelter)
competition
the gradual change from one ecosystem to another; when the environment changes over time
succession
succession that occurs on surfaces where there is rock, no soil exists at first
primary succession
succession that occurs in an ecosystem that was damaged but some soil remained
secondary succession
living or nonliving things (biotic or abiotic) that help control the growth of population in an ecosystem (food, water, sunlight, air, space, habitat)
limiting factors or resources
a species that could become endangered in the near future; population is dropping
threatened
a species that is in danger of becoming extinct; population is so low that they may soon be gone forever
endangered
an entire species has died out or gone forever; population is zero
extinct
species that occur naturally in a particular area
native species
a species that is not naturally found in a particular area and may be helpful or harmful to that new ecosystem
introduced species
an introduced species that has a negative impact on an ecosystem; takes over an environment
invasive species
substances that are very harmful to humans and other organisms
hazardous waste
protecting and preserving natural resources and the environment
conservation