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: Climate is the average weather in an area over a long period of time. 
Fact 2: Landscape is in turn altered by climate and weather.
The average weather in an area alters that area's landscape.

Fact 1: Earthworms are important deposit feeders that help form and enrich soil. 
Fact 2: For instance, in the forest, plants use sunlight and soil nutrients to grow.
earthworms help plants grow.

Fact 1: planting trees has a positive impact on an ecosystem. 
Fact 2: Human beings live within the world's ecosystems.

planting trees has a positive impact on humans.