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.

Example Input: Fact 1: Most species go through larval stages after hatching. 
Fact 2: Geckos hatch from eggs.
Example Output: Geckos go through larval stages while growing.

Example Input: Fact 1: cutting down trees has a negative impact on an ecosystem. 
Fact 2: Ecosystems are living communities.
Example Output: Cutting down trees has a negative impact on living communities.

Example Input: Fact 1: a battery converts chemical energy into electrical energy. 
Fact 2: Electricity is a powerful energy source.
Example Output:
A battery converts chemical energy into a powerful energy source.