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: when a plant grows , the size of the leaves of that plant may increase. 
Fact 2: Leaves are the main sites of photosynthesis.
answer:
when a plant grows the main site of photosynthesis increases in size.


question:
Fact 1: a plant requires water to grow. 
Fact 2: Plants respond to fertility and watering by growing larger and producing more blooms, but they will grow and bloom well with just average conditions.
answer:
A plant will grow larger and bloom.


question:
Fact 1: Skin color is a polygenic trait. 
Fact 2: Polygenic inheritance Polygenic traits are controlled by an unknown number of genes.
answer:

Skin color is inherited from a number of genes.


