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.

Input: Consider Input: Fact 1: plant reproduction often requires pollen. 
Fact 2: Honeybees and other bees transfer the pollen.

Output: Plant reproduction often requires honeybees.


Input: Consider Input: Fact 1: Many consumers feed at more than one trophic level. 
Fact 2: Nutrient levels are referred to as trophic status.

Output: Many consumers feed at more than one nutrient level.


Input: Consider Input: Fact 1: a sandbar is formed by water moving sediment downstream. 
Fact 2: Rocks and sediments are pushed along the river.


Output: a sandbar is formed by rivers.