Answer:
Thylakoids.
Explanation:
Thylakoids absorb light through light harvesting complexes.
The slightest change in pH can destroy the substance or organism. The pH of a cell's interior helps regulate the cell's chemical reactions. For example, the pH of blood is 7.4, if blood falls to 6.8 or lower or 8.2 or higher, it results in death.
Because tropical levels used to be broken because temperatures hasn't varied in the years and history of global temperatures and history.