................. acts as extra-embryonic gut while.................... acts as extra-embryonic kidney,

Explanation

To answer the question regarding which structures act as extra-embryonic gut and kidney, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Extra-embryonic Membranes**: There are four extra-embryonic membranes associated with the developing embryo: Chorion, Amnion, Allantois, and Yolk sac.

2. **Determine the Function of Each Membrane**:
- **Chorion**: This membrane forms the outer protective layer around the embryo.
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