instruction:
Combine the given two facts to write a concluding fact. Note that there should be some parts of the first and second facts that are not mentioned in this conclusion fact. Your combined fact should be the result of a chain between the two facts. Chains form when two facts connect together to produce a concluding fact. An example of a chain is: "pesticides cause pollution" (fact1) + "pollution can harm animals" (fact2) → "pesticides can harm animals" (conclusion fact). Parts of the concluding fact overlap with the first and the second fact. To construct such a  concluding fact, a useful way is to borrow the subject from one fact and the ending conclusions from another fact.
question:
Fact 1: cutting down trees has a negative impact on an ecosystem. 
Fact 2: An ecosystem can be in a desert, a tropical jungle, an ocean or a pond.
answer:
cutting down trees has a negative impact on a jungle.


question:
Fact 1: conserving resources has a positive impact on the environment. 
Fact 2: Environments reflect native habitats.
answer:
conserving resources has a positive impact on native habitats.


question:
Fact 1: Fungi lack chlorophyll, so they cannot make food by photosynthesis as plants can. 
Fact 2: Like a mushroom, it lacks chlorophyll and is nonphotosynthetic.
answer:

Mushrooms are nonphotosynthetic and cannot make food to grow.