Well it could be health issues to the unborn child...
Our environment plays a big role in our health. If we do not asses our environment, our risk of sickness an disease increases. Any kind of chemical or radiological substances in the air, are exposures that can affect our health. Meaning, the air we breathe, foods that we eat, water we drink from, and products that we use can sicken us if they aren't properly cleaned or pure.
Conjunctiva
The conjunctiva is a mucus membrane that covers the front of the eyeball. The “white part” of your eyes.
Breaking the body into systems is in most cases a lot easier for the students to understand instead of just doing it all at once