instruction:
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.
question:
Fact 1: Cartilage is a tough tissue that contains a protein called collagen. 
Fact 2: Membranes attached to the cricoid cartilage .
answer:
Cricoid is a tough tissue that contains a protein called collagen.


question:
Fact 1: Energy is passed up a food chain or web from lower to higher trophic levels. 
Fact 2: Plants represent the first trophic level.
answer:
Energy is passed up a food chain from plants.


question:
Fact 1: erosion causes a river to become deeper and wider. 
Fact 2: Fertile topsoil is then lost in erosion.
answer:

deepening rivers cause the loss of topsoil.