About 20% of the world's farming soil and 50% of the world's irrigated land are affected by high soil salinity (salt levels). This is an example of which of the following?
A. A genetic factor impacting how plants will grow
B. An environmental factor impacting how plants will grow
C. A hereditary factor impacting how plants will grow
D. A universal factor impacting how plants will grow

Question

About 20% of the world's farming soil and 50% of the world's irrigated land are affected by high soil salinity (salt levels). This is an example of which of the following? 
A. A genetic factor impacting how plants will grow 
B. An environmental factor impacting how plants will grow 
C. A hereditary factor impacting how plants will grow 
D. A universal factor impacting how plants will grow

bioepic · Answer

B. Salinity is an environmental factor.

anonymous · Answer

You sure @BioEpic

anonymous · Answer

He's definitely right. Only an outside, or environmental, force can increase the salinity here. The answer is B, for sure. :)

bioepic · Answer

Yes - I'm sure! :)
Thanks for the clarification @musicmadi