D because if the species was to be removed from an ecosystem, everything that needed that species as food, or the species ould have to adapt to the foods available in the new ecosystem they live in. Hope I helped, and let me know if you are still not 100% sure about the answer, and I'll try to clarify what I said.
Have you got the list of characteristics on you? If not, both contain cells with chloroplasts, which is used to carry out the photosynthesis. Hope this helps.
D. Growth. Material forming cells or tissue like cytoplasm.
<span>protista is a producer because it is a plant</span>
Mmmmmm mercury sexiest planet thanks for the pic