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: Organisms that live in marine biomes must be adapted to the salt in the water. 
Fact 2: Estuaries display characteristics of both marine and freshwater biomes.
Example Output: Organisms that live in estuaries must be adapted to the salt in the water.

Example Input: Fact 1: Electron transport is the final stage of aerobic respiration. 
Fact 2: Aerobic respiration is an oxidative process which uses oxygen as a final electron acceptor.
Example Output: oxygen is used as an electron acceptor in respiration.

Example Input: Fact 1: harming an animal species has a negative impact on the population size of that species. 
Fact 2: Pollution is usually harmful to one or more species of animal or plant.
Example Output:
Pollution is usually harmful to population size of a species.