Here are the matches for the marine pollutants to their corresponding health and environmental effects:
**Sewage and inadequate sanitation:**
1. Pathogens cause typhoid gastroenteritis - **Correct match**
2. Smothers marine plants and animals - **Not a match**
3. It interferes with the breeding of birds - **Not a match**
In summary, sewage and inadequate sanitation primarily lead to the introduction of pathogens, which can cause diseases like