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1. 
An ecosystem is made of...
A.
living things.
B.
the physical environment.
C.
living things, non-living things and the physical environment.
2. 
Animals can only reproduce with members of the same...
A.
species.
B.
population.
C.
community.
3. 
A population includes...
A.
all the living things in an ecosystem.
B.
a group of animals travelling together.
C.
all the organisms of one species in an ecosystem.
4. 
What are the three types of terrestrial ecosystems?
A.
lagoons, rivers and sandy beaches.
B.
forests, mountain grasslands and deserts.
C.
open sea, mediterranean forest and rocky shores.
5. 
Producers...
A.
feed on plants and algae.
B.
are living things that make their own food.
C.
break down dead animals and plant materials.
6. 
In saltwater ecosystems, we find...
A.
sandy beaches, rocky shores and open sea.
B.
mountain grasslands, forests and lagoons.
C.
rivers and lagoons.
7. 
Animals that eat the remains of dead animals are called...
A.
producers.
B.
scavengers.
C.
decomposers.
8. 
One species benefits while the other remains unaffected in...
A.
commensalism.
B.
parasitism.
C.
competition.
9. 
In a relationship of competition...
A.
two species benefit from each other.
B.
two species have the same needs.
C.
only one species benefits.
10. 
Many food chains joined together form...
A.
a food party.
B.
an aquatic ecosystem.
C.
a food web.