Ch 4 Science Review

In order for an animal to survive...

• All of their needs must be met. 
• an ecosystem must be unbalanced.

When no other animals take over an ecosystem, this is a....

• unbalanced ecosystem 
• balanced ecosystem 

What does mining do for the environment? 

• replaces the soil 
• only causes harm 

When the climate changes in an ecosystem...

• the plants and animals also change 
• the ecosystem remains the same

What can cause a plant or animal to become extinct? 

• Plenty of food for the animal
• Their home is destroyed

What is a parasite?

• Organism that harms
• Organism being harmed

How do producers and consumers help keep an ecosystem balanced?

• Producers make oxygen and the animals need this oxygen
• They eat all living things

Succession is...

• the sudden change in an ecosystem
• when an ecosystem slowly changes over time

Fossils can tell scientists

• what used to live in an ecosystem
• only about the present time

Nocturnal means

• awake during the day 
• awake at night to hunt