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.

Fact 1: chemical splashing can cause harm to humans. 
Fact 2: Humans are animals too.
chemical splashing can cause harm to animals.

Fact 1: Mollusks are invertebrates such as the common snail. 
Fact 2: Invertebrates have no backbone.
mollusks have no backbone.

Fact 1: a seismometer is used to measure the strength or magnitude of an earthquake. 
Fact 2: The seismometer will check for seismic activity.

Seismic activity tells us the strength or magnitude of an earthquake.