Dying stars can explode.
A dying star can become a black hole.
A dying star can expand and get bigger right before they die.
Answer:
Stimulus is a detectable change in the physical or chemical structure of an organism's internal or external environment. The ability of an organism or organ to detect external stimuli, so that an appropriate reaction can be made, is called sensitivity.
C. when recycling, people can re-use the material/products.
Your answer would be biome.
Hopes this helps :)