Improvements in harvesting systems include all of the following advances EXCEPT trees are now cut closer to the ground. trees are lifted by machine instead of manually. trees can be transported using much smaller equipment. trees grow at faster rates than they did in previous decades.

the answer to your question is b

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.

i think the answer is b.

her next move would be to use agarose gel electrophoresis to separate the dna molecules of varying length and create a dna fingerprint.