Unit 4

Multiple Select

These factors affect aquatic ecosystems...

• sunlight

• temperature

• salt

• freshwater and saltwater

Multiple Choice

Saltwater ecosystems are classified by the amount of..

• Salt

• Plants

• Life

• Sunlight

Multiple Choice

You can drink water in freshwater ecosystems.

• True

• False

Multiple Select

Freshwater ecosystems are classified in..

• Coasts

• Open sea

• Still water

• Flowing water

Multiple Select

Saltwater ecosystems are classified in...

• Flowing water

• Open sea

• Still water

• Coasts

Multiple Select

Which are the main causes of extinction?

• Hunting and overfishing

• Pollution

• Recycling

• Destruction

Multiple Choice

How can we define BIODIVERSITY?

• a variety of living things

• million of food in the world

• disappearance of a species

• a group of people that makes plays together

Multiple Select

How can people look after the ecosystems?

• Saving water

• Saving waste

• Saving energy

• Saving nature

Multiple Choice

Temperature, humidity, relief and soil affect...

• Terrestrial ecosystems

• Aquatic ecosystems

• Saltwater ecosystems

Multiple Choice

The most biodiverse ecosystems are...

• Mountain and valleys

• Deserts and polar regions

• Rainforest and coral reefs

Multiple Choice

Light, temperature and .... affect aquatic ecosystems.

• rocks

• algae

• salt

Multiple Choice

Which types of rocks are formed at the bottom of the sea?

• Coal

• Granite

• Limestone

• Basalt

Multiple Choice

Life is richer in areas where there is not more humidity.

• TRUE

• FALSE