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: Algae have varied life cycles. 
Fact 2: Coccolithophorids are members of the Algae.
Example Output: Coccolithophorids have varied life cycles.

Example Input: Fact 1: Bone is less flexible than cartilage but stronger. 
Fact 2: Articular cartilage is the cartilage that covers the bone and the joint areas.
Example Output: bone is  less flexible but stronger than the material that covers it.

Example Input: Fact 1: carbon dioxide concentrations in the air have increased over the last decade dramatically. 
Fact 2: Carbon dioxide is the chief culprit in the increased threat of global warming in recent decades.
Example Output:
The rise in carbon dioxide concentrations contributes to the increase in global warming threats.