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: Chloroplasts contain the green pigment chlorophyll. 
Fact 2: Mitochondrion and chloroplast for example are organelles.

A: organelles contain chlorophyll.
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Q: Fact 1: fossils are formed when layers of sediment cover the remains of organisms over time. 
Fact 2: All streams carry sediment .

A: Fossils are formed when layers of something streams carry cover the remains of organisms over time.
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Q: Fact 1: magnetism can cause objects to repel each other. 
Fact 2: Magnetism A compass works on the principle of magnetism and points to the North Magnetic Pole.

A:
A compass works on the principle of the objects ability repel each other.
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