In this task, you are given a question and a corresponding answer. Your task is to generate a fact statement that is useful in answering the given question.

[Q]: Question: To positively affect the environment? Answer: cultivate dogwoods and oaks.
[A]: planting trees has a positive impact on an ecosystem

[Q]: Question: What is a source of oxygen through photosynthesis? Answer: sunflowers.
[A]: plants are a source of oxygen through photosynthesis

[Q]: Question: If an ice cube that weighs 2 ounces melts, in liquid form, it will? Answer: weigh the same.
[A]:
phase changes do not change mass