Author Question: What might be the purpose of planting trees around fields? A) to provide habitats for pest eating ... (Read 111 times)

wenmo · **on:** Aug 27, 2018

What might be the purpose of planting trees around fields?

A) to provide habitats for pest eating animals
B) to act as wind breaks
C) to provide cooling shade
D) to provide nitrogen fixation
E) only A and B

Question 2

How does a suspension differ from a solution?

A) A suspension is a heterogeneous mixture whose components can be separated by simple filtration. A solution is a homogeneous mixture which cannot be separated by simple filtration.
B) A suspension is a heterogeneous mixture consisting of different phases whereas a solution is a homogeneous mixture consisting of a single phase.
C) Although a solution and suspension are both homogeneous mixtures, only the components of a suspension will separate by spinning the mixture in a centrifuge.
D) The difference between a suspension and a solution can only be determined by chemical means.