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How Do Environmental Changes Affect Organisms? Pages 263-275

Teacher: William Etheridge
Across
Occurs when little rain falls
Occurs when the population of a species grows quickly after it is introduced into a new environment
Occurs when an ecosystem has been disturbed but soil is still preset
Protecting ecosystems and the organisms living in them
Happens when all the members of a certain species die
Happens when the earth's temperatures are colder than normal for a very long time
Down
Begins on bare rock, such as after a volcano erupts
The first organisms to colonize
The gradual change of organisms in an ecosystem
The contamination of air, water, or soil by substances harmful to organisms
Occurs when algae release large amounts of harmful chemicals into the water and cause oxygen levels to drop