DDT is an insecticide that was used extensively in the mid-1900s to kill mosquitos. it was very effective at first, but after a few decades DDT became less effective at killing mosquitos because many populations had evolved resistance to DDT. which of the following conditions would biologists say was required for the evolution of DDT resistance in a population

i believe the correct answer is d

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.

earthquakes in florida are rare because the state is not located near any tectonic plates. in fact, florida is tied for first place as having the fewest earthquakes of any state. much of florida is limestone and seafloor materials that is not conducive to earthquakes.

explanation: