Chlorophyll the pigment gives the plant their green color and let's them absorb sunlight more of Chloroplast a part that is cell found in plants that coverts light energy into energy plants which use "Sugar".
If this is wrong let me know and I'll help you the best I can enjoy and have a nice day!
The actual answer is, "A", an ocean trench.
You can find out more about them by researching them up on Google, it's only a few phrases and a hit on the enter key :P
It is between A and B.
But if the species is going to be extinct, that means that they are being threatened.
So the answer is B.
