TASK DEFINITION: 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.
PROBLEM: Fact 1: soil is formed by weathering. 
Fact 2: Dirt is really misplaced soil.

SOLUTION: Dirt is formed by weathering.

PROBLEM: Fact 1: Chromosomes contain genes, which code for proteins. 
Fact 2: Information on DNA is organized into genes.

SOLUTION: DNA codes for proteins.

PROBLEM: Fact 1: a long tail can be used to move through water by an animal. 
Fact 2: Water remains in the current of the river.

SOLUTION:
A long tail helps an animal navigate through a river.