To protect itself from herbivores, plants

a, have thorns

b, secrete toxins

c, cannot do anything because they cannot protect themselves

d, both secrete toxins and have thorns

The answer your looking for is : D) Both Secrete Toxins And Have Thorns. Sorry I'm late but I hope this helps!

-Mo x

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.

haploid cells;