11. One way of changing our impact on the environment we live in is to ...
A. use a car instead of a bus to get to work
B. pack our garbage in smaller bags
C. bathe every day instead of showering
D. become aware of all the resources you use

12. An ecosystem thrives with biotic and abiotic component parts. An example of
an abiotic part of an ecosystem is ...
A. micro-bacteria
C. water
D. decaying plants
B. fungus

13. Food chains and food webs are models in science which visually show us the
different relationships within an ecosystem. The primary difference between
the food chain and the food web is ...
A. a food chain shows how energy is stored
B. a food web shows how energy is used
C. a food web is a complex system of food chains
D. a food chain is a combination of different food webs​