Which of the following is or are included in secondary treatment of sewage?
(i) Anaerobic microbe
(ii) Aerobic microbe
(iii) Autotrophic microbe
(iv) Heterotrophic microbe
(v) Bacteria
(vi) Fungi

Explanation

To determine which of the given options are included in the secondary treatment of sewage, we need to analyze each option based on the role of different types of microbes in this process.

### Step-by-Step Solution:

1. **Understanding Secondary Treatment**:
- Secondary treatment of sewage is primarily a biological process aimed at breaking down organic matter in sewage using microorganisms.

2. **Evaluating Each Option**:
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