Ants searching for food establish "road signs" so other ants can follow their trailsAnts make trail markers using pheromones . Pheromones are chemicals secreted by an organism . They trigger a response from other members of the same speciesMany organisms communicate with these chemical signals . The pheromones provide measures
rewards
colors
directions

type of error:

the error in the sentence is a "dangling modifier". a dangling modifier is a phrase, word or clause that "dangles" because there is not target to modify. in this case, "after mopping the floor" is the dangling modifier since it has no word to modify. the noun "house" cannot mop the floor; therefore there is a mistake in the writing of the sentence.

its definitely second person : )

explanation:

i think it's either 'to expose the corruption of the communists in russia', or 'to criticize animal brutality by communists in russia.'  

hope this ! : )