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: the gravitational pull of the Moon on Earth 's oceans causes the tides. 
Fact 2: Tides create current.

Output: The gravitational pull of the Moon on Earth's ocean contributes to ocean currents.


Input: Consider Input: Fact 1: a radio converts electrical energy into vibrations. 
Fact 2: Electrical energy refers to energy associated with the flow of electrons.

Output: a radio converts the flow of electrons into vibrations.


Input: Consider Input: Fact 1: Fertilization occurs when a sperm and an egg fuse to form a diploid zygote. 
Fact 2: If a human ovum is fertilized, a zygote is formed.


Output: a zygote is formed by an ovum.