Conservation is needed for biodiversity. If one organism (plant or animal) goes extinct it disrupts the food chain and the ecosystem forcing plants an area to go extinct themselves or to migrate. The greater the biodiversity the the healthier the ecosystem is and vice versa.
C. Nitrogen is found in both DNA and proteins.
The chemical reaction could be vary with the condition but the nuclear decay rate is constant, here the option A is the right option.
The third one made the most sense
