NADPH is a reduced form of NADP+. The latter features an extra hydrogen ion in its chemical structure. When NADP+ transforms into NADPH, the other hydrogen ion is released as part of the reaction while the other hydrogen ion becomes a part of the NADPH structure.
If you are talking about frequency in terms of waves, it is in seconds^-1
it is not because trees do not grow fast enough
The level most commonly meant by the term biodiversity is the species level.
