4 is true with question you asked
Answer:
because it can cause you severe reaction that could kill you
Answer:
Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population.
A phenomenon, in the scientific context, is an observable event that can range from a seasonal hazard to a technological issue. For a scientist, a phenomenon is an observable event.
A complex chemistry is most related to maintaining a stable internal environment.
