3.9A

Some students set up an aquarium containing water, fish, and plants.  Plants help support the survival of fish because they - 

• remove nutrients from the soil
• use the energy of sunlight
• absorb water from their surroundings
• add needed resources to the water

When a hurricane comes ashore, it brings large amounts of salt water with it.  How might this affect the organisms in fresh water environments?

• The plants in the fresh water will move to a new location. 
• The number of organisms in the environment will increase.
• Animals in this environment will begin to grow much larger. 
• Organisms that cannot survive in salty water will not survive.

How might cutting down the trees in a forest environment affect the animals that live there?

• All of the animals in the forest will perish in a short period of time. 
• Animals that cannot find what they need will move.
• The animals will move underground to find what they need.
• Most animals will eat different kinds of food in order to survive.

The table shows the basic needs of a robin.  Which environmental change would be harmful to the survival of a robin?

• Prairie dogs digging tunnels in the ground.
• Beavers building dams across streams.
• Humans clearing forests to build houses.
• Ants building large anthills in a schoolyard.

All the living and nonliving things in an area - 

• Thrive
• Ecosystem
• Population
• Perish

What need for a turtle should be added to the list above?

• snow to fall on it

• trees for it to climb

• predators to hunt it

• air for it to breathe

Lack of rainfall caused a river to dry up. This river is where salmon lay their eggs. All of the following are likely results of this environmental change EXCEPT -

• the salmon population will decrease

• predators that feed on salmon will hunt elsewhere

• there will be more plants that live in the water

• other animals that live in the water will leave

____________ air rises because it is ____________dense.

• Cool, Less
• Warm, Less
• Cold, More
• Warm, More

____________ air sinks/falls because it is ____________dense.

• Cold, More
• Warm, Less
• Cold, Less
• Warm, More

This Symbol is associated with a _____________________Front.

• Warm
• Occluded
• Cold
• Stationary