15. Which of the following is usually with a large size or high abundance?
(A) Foundation species
(B) Keystone species
(C) Ecosystem engineers
(D) None of the above
答案:登入後查看
統計: A(3), B(1), C(1), D(0), E(0) #3411499
統計: A(3), B(1), C(1), D(0), E(0) #3411499