Changes in Ecosysems 5.9C

Which of these populations is most likely to decrease if the number of grasshoppers decreases?

• plants
• frog
• praying mantis
• owl

Natural disasters can also change ecosystems. What can organisms do if a disaster happens?

• Fight, Survive, Struggle
• Relocate, Adapt, Die
• Stay, Sleep, Survive
• Eat, Sleep, Repeat

Which is NOT an example of a natural environmental change?

• a beaver dam
• a hurricane
• a volcanic eruption
• a housing development

An example of a natural change to the ecosystem is:

• A highway built in the middle of the desert. 
• Lightening strikes and starts a fire in the forest. 
• A rancher placing too many grazers in a small area leading to overgrazing.

The removal of trees and plants can cause problems such as soil erosion. 

• True
• False

How does a bird "change its environment" to meet its NEEDS?

• builds a nest
• flies around
• catches bugs
• looks for something to eat

6. A squirrel makes a change to its environment when it —

• climbs a tree
• digs a hole to bury an acorn
• collects acorns
• jumps from tree to tree

What do scientist call organisms that are not native to an ecosystem and cause harm to native organisms?

• native plants
• invaders
• invasive species
• natural species

Which of the following would have a negative impact on an ecosystem

• constructing highways
• planting trees
• recycling paper

When a certain population becomes so dense that it harms or changes the quality of life in that environment, we have...

• a population
• overpopulation
• pollution