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: landfills have a negative impact on the environment. 
Fact 2: An ecosystem is an environment and all the members of that environment.

A: Landfills have a negative impact on the ecosystems.
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Q: Fact 1: Viruses cannot reproduce by themselves. 
Fact 2: Bats can also transmit rabies and rabies-like viruses.

A: rabies cannot reproduce by itself.
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Q: Fact 1: Earth 's tilt on its rotating axis causes seasons to change. 
Fact 2: Whatever the season wet weather and cold weather clothing is essential.

A:
Earth's tilt on its rotating axis causes wet and cold weather.
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