Section: Natural Sciences

7) Sulfur is important in an ecosystem because it is:

1. essential in photosynthesis.
2. essential in respiration.
3. essential for many proteins in certain enzymes.
4. important for salt balance in vertebrate blood.
5. important in nerve impulse transmission.

While carbon, hydrogen, and oxygen suffice for all carbohydrates and fats, proteins can not be synthesized without additional elements including nitrogen and, sometimes sulfur.