A synonym is kind, caring, or nice.
The chemicals had caused the eruption of smoke that filled the air. (Not sure if this is 100%)
Here are the answers: r<span>esponse to distress, adaptation to an environment, and inherited survival characteristics.
Basically, natural selection was proposed by Charles Darwin, the Father of Evolution. Natural selection is the process on how an organism adapts to its environment in order to survive and reproduce. Organisms tend to evolve in order to response to certain stimulus and stressors in their environment in order to better adapt and as they evolve, the traits they possess becomes inherited by their offsprings.</span>
