well according to my memory and one of the save the earth communities, the great white shark is almost extinct cause of pollution, and mainly poachers, lots of poachers for soup made of shark fins.
they would cut off the fin then throw the dead shark back in the ocean.
i hope this helped.
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Letter D would be likely it
NADP
Photosystem 1 is a photochemical reaction
complex that uses energy from the light to produce high energy carriers NADPH
and ATP. Chlorophyll complex p700 have being identified as the photo-oxidation
reaction Centre in photosystem 1. However, NADP is known to be the final
electron acceptor in photosystem 1.
Provided that there's no diagram, most molecules have particular areas on the molecules, called the "active area" that act as a lock to a particular substrate's molecular structure, providing the key.
An enzyme's active area is only able to be "unlocked" by a certain substrate's "key".
