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: Cells cannot survive without oxygen. 
Fact 2: Survival is to live, to live means hope.
answer:
Cells cannot live without oxygen.


question:
Fact 1: when a body of water receives more water than it can hold , a flood occurs. 
Fact 2: Floods are deadly, floods are devastating.
answer:
When a body of water receives more water than it can hold, death and devastation can result.


question:
Fact 1: Some pelycosaurs gave rise to a group of animals called therapsids. 
Fact 2: Therapsids are reptiles ancestral to mammals.
answer:

Some pelycosaurs gave rise to  reptile ancestral to mammals.