Given a scientific question, generate a correct answer to it.

Example Input: What happens when turgid cells in a nonwoody tissue push against each other?
Example Output: the tissue stiffens

Example Input: What phenomenon makes global winds blow northeast to southwest or the reverse in the northern hemisphere and northwest to southeast or the reverse in the southern hemisphere?
Example Output: coriolis effect

Example Input: What produces almost one-half of the earth's oxygen through photosynthesis?
Example Output:
protists