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: Some viruses have an envelope of phospholipids and proteins. 
Fact 2: Viruses are enveloped by similar membranes.
Example Output: viruses have similar membranes.

Example Input: Fact 1: Cells cannot survive without oxygen. 
Fact 2: Survival is to live, to live means hope.
Example Output: Cells cannot live without oxygen.

Example Input: Fact 1: medicine is used for curing people when they are sick. 
Fact 2: Botanical Medicine Many plant substances are powerful medicines.
Example Output:
Many plant substances are powerful cures for people when they are sick.