(Q).
You are presented with the question "what causes harm to living things?" and the following answer choices: - toxins - vitamins - bacteria - cyanide - leeches - h2o - oxygen - Pesticides Now knowing that poison causes harm to living things and carbon monoxide and cyanide are poisons, choose the best answer.
(A).
cyanide

(Q).
You are presented with the question "What are pheromones used for?" and the following answer choices: - Taste - photosynthesis - spread flower seeds - Plant reproduction - Sound - Plants growth - Communication - Sleep Now knowing that animals can communicate with sounds, chemicals, or visual cues and pheromones are chemicals produced by animals allowing individuals of a species to communicate, choose the best answer.
(A).
Communication

(Q).
You are presented with the question "what does not accept heat very well?" and the following answer choices: - corn - air - coal - fats - oil - rust - Man - mold Now knowing that if heat is conducted to an object then that object will become hot and air conducts heat poorly, choose the best answer.
(A).
air