请教老师从句中什么时候用whatever,whoever,whichever它们在句子中做什么成分,与what,who,which区别
There is hardly an environment on earth --some species of animal or other has not adapted successfully.A.to which B.wherever C.so D.as（我做这题时,发现上述知识不懂,不知道B哪里错）麻烦知道的老师指导下,学生先谢谢了