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.
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Question: Fact 1: Viruses cause many human diseases. 
Fact 2: Human viruses are created by natural process.

Answer: Something created by a natural process  cause many human diseases.


Question: Fact 1: if seeds stick to the fur of an animal then that seed will be transported by the animal. 
Fact 2: Along with the wind, birds are the primary transporters of berries and seed.

Answer: Birds can carry seeds in their feathers.


Question: Fact 1: the Earth being tilted on its axis causes ones side of the Earth to receive less energy from the Sun than the other side. 
Fact 2: During winter, the earth in the Northern Hemisphere is tilted away from the sun.

Answer:
Winter is caused from being tilted away from the sun and receiving less energy.