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.

[Q]: Fact 1: cutting down trees has a negative impact on an ecosystem. 
Fact 2: Ecosystems are living communities.
[A]: Cutting down trees has a negative impact on living communities.


[Q]: Fact 1: a plant requires water to grow. 
Fact 2: Clouds form by the condensation of water vapor.
[A]: a plant requires Clouds to grow.


[Q]: Fact 1: Mollusks are invertebrates such as the common snail. 
Fact 2: All mollusks come from eggs.
[A]:
The common snail comes from eggs.