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: Steroid hormones are made of lipids, such as phospholipids and cholesterol. 
Fact 2: Lipids Lipids are diverse hydrophobic molecules.
Example Output: Steroid hormones are made of diverse hydrophobic molecules, such as phospholipids and cholesterol.

Example Input: Fact 1: a delta is formed by deposition of sediment at the mouth of a river by water fanning out. 
Fact 2: Sand is an example of a clastic sediment.
Example Output: a delta is formed by deposition of sand at the mouth of a river by water fanning out.

Example Input: Fact 1: competition may cause animals to fight towards members of their own species. 
Fact 2: Competition between male animals is common in nature.
Example Output:
males fight their own species.