Piles of dung can't be relied upon when it comes to estimating elephant numbers because
A.they are different in size. B.they scatter all over the region. C.they are different in decay rate. D.they are different in quality.正确答案C
Piles of dung can't be relied upon when it comes to estimating elephant numbers because
A.they are different in size. B.they scatter all over the region. C.they are different in decay rate. D.they are different in quality.正确答案C
