[单选题]
3. Which of the following are correct in r(q t;wmwp .as8egaxv mi y a.wj+7w(4i(xmrd to EDGE species?
I. Their genome is relatively unique.
II. Their morphology is common to several species.
III. They are producers in the ecosystem.
IV. They are endangered.
A. None of the above.
B. II and III only.
C. II, III and IV only.
D. I and IV only.