instruction:
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.
question:
Fact 1: some light bulbs convert electricity into light and heat energy. 
Fact 2: Light Bulbs Incandescent bulbs are available at the front desks.
answer:
Incandescents convert electricity into light and heat energy.


question:
Fact 1: soil is formed by rocks eroding. 
Fact 2: Soils are formed by breakdown of rock.
answer:
rocks eroding causes them to breakdown.


question:
Fact 1: Osteoporosis is a disease in which osteoclasts are more active than osteoblasts. 
Fact 2: Osteoporosis is a disease of the bones.
answer:

a disease in which osteoclasts are more active than osteoblasts is bone disease.