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.

[Q]: Fact 1: Hagfish are noted for secreting large amounts of thick, slimy mucus. 
Fact 2: Today, jawless fish include the lampreys and hagfishes.
[A]: Some jawless fish secrete large amounts of thick, slimy mucus.


[Q]: Fact 1: HIV infects and destroys helper T cells. 
Fact 2: Helper T cells are the critical link in our immune system.
[A]: HIV damages our immune system.


[Q]: Fact 1: melting means changing from a solid into a liquid by adding heat energy. 
Fact 2: Ice is the solid form of water.
[A]:
melting changes ice to water by adding heat energy.