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: Adult tunicates are barrel-shaped. 
Fact 2: Bulbs are classifies as tunicate or non-tunicate.

SOLUTION: Adult Bulbs are barrel-shaped.

PROBLEM: Fact 1: Mollusks reproduce sexually. 
Fact 2: Some mollusks have a shell.

SOLUTION: some animals with shells reproduce sexually.

PROBLEM: Fact 1: Earthworm burrows help aerate soil, which is also good for plants. 
Fact 2: Potted plants in season include chrysanthemums, daisies and cyclamen.

SOLUTION:
earthworms are good for daisies.